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Home / Gear / Jackets / Insulated Jackets

Temperature Ratings of Insulated Jackets

Last updated: August 25, 2023 by Canberk Koksal

  • This article is revised after Arc'teryx FW24 update. 

Summary

  • Temperature Ratings of Insulated Jackets

NameEst. Temp (F/C)ReviewPit venting?Two way zipper?Stuffs into itself?TypeFill PowerFill Weight (grams)Fill Volume (FP x FW)Synthetic Insulator (SI)SI AmountFace FabricActivityFitWeightLength (CB)Discontinued?
Arc'teryx Alpha (Men's - Women's)-18/-28ReviewNoYesYesDown850296251,600Coreloft90 g/m²N30r 2L GoreTex InfiniumClimbingRegular805 g / 1 lb 12.4 oz86 cm / 34 inNo
Feathered Friends Khumbu-17/-27NoNoYesDown900378340,200Primaloft Gold200 gPretex Shield XTAll RoundRegular960 g / 2 lb 2 oz?No
Arc'teryx Ceres SV (Men's - Women's)-15/-26ReviewNoYesYesDown850240204,000Coreloft?Arato 30All RoundRegular880 g / 1 lb 15 oz86 cm / 34 inYes
Mountain Equipment K7 (Men's)-13/-25NoYesYesDown800300240,000N/AN/A30D DriliteAll RoundRegular820 g / 1 lb 13 oz76 cm / 30 inNo
Rab Positron Pro (Men's)-13/-25NoYesYesDown800300240,000N/AN/A40D Pertex Quantum ProAll RoundRegular740 g / 1 lb 10 oz85 cm / 33.5 inNo
Arc'teryx Therme SV (Men's)-11/-24ReviewNoYesNoParka750211158,250Coreloft60 g/m²2L Gore-TexAround TownRegular1.072 kg / 2 lb 5.8 oz96 cm / 37.75 inNo
Patagonia Grade VII (Men's)-11/-24NoYesNoDown800335268,000N/AN/A1.2 oz 15 & 20D Perfex QuantumAround TownRegular743 g / 1 lb 10.1 oz83 cm / 32.5 inNo
Arc'teryx Firebee AR (Men's - Women's)-10/-23ReviewNoYesYesDown800225180,000N/AN/AArato 7 & 10All RoundRegular680 g / 1 lb 8 oz79 cm / 31 inYes
Mountain Equipment Exo (Men's)-10/-23NoYesYesDown800265212,000N/AN/ANylonAll RoundRegular770 g / 1 lb 11.2 oz79 cm / 31 inNo
Arc'teryx Thorsen (Men's)-7/-22ReviewNoYesNoParka750192144,000Coreloft60 g/m²90D 2L Gore-TexAround TownRegular1.1 kg / 2 lb 5.4 oz91 cm / 36 inYes
Patagonia Frozen Range (Men's - Women's)-6/-21ReviewNoNoNoParka700268187,600N/AN/A4 oz 75-denier polyesterAround TownRegular1.253 kg / 2 lb 12.2 oz84 cm / 33 inNo
Mountain Equipment Li. Ec. (Men's - Women's)-5/-20NoYesNoDown700295206,500N/AN/A50D DriliteAll RoundRegular822 g / 1 lb 13 oz72 cm / 28 inNo
Arc'teryx Thorium Parka (Women's)-2/-19ReviewNoYesNoParka750209156,750Coreloft80 + 140 g/m²Arato 20Around TownRegular610 g / 1 lb 5.5 oz115.8 cm/ 45.6 inNo
Rab Neutrino Pro (Men's - Women's)-2/-19NoYesYesDown800212169,600N/AN/A20D Pertex Quantum ProAll RoundRegular585 g / 1 lb 8.6 oz77 cm / 30.3 inNo
Arc'teryx Patera Long (Women's)0/-18NoYesNoParka750204153,000Coreloft60 + 80 g/m²2L Gore-TexAround TownRegular1.1 kg / 2 lb 6.8 oz117.5 cm / 46.25 inNo
Arc'teryx Beta Down Insulated (Men's)0/-18YesYesNoParka850126107,100Coreloft80 g/m²2L 40D Gore-TexAll RoundRegular760 g / 1 lb 10.8 oz?No
Arc'teryx Dually Belay (Men's)0/-18ReviewNoYesYesSyntheticN/AN/AN/AThermaTek92 g/m²30D NylonAround TownRegular705 g / 1 lb 9 oz84 cm / 33 inYes
Arc'teryx Centrale (Women's)0/-18ReviewNoYesNoParka750157117,750Coreloft60 g/m²N90p NylonAround TownRegular885 g / 1 lb 15.2 oz95 cm / 37.5 inYes
Arc'teryx Camosun (Men's)0/-18ReviewNoNoNoParka75010578,750Coreloft140 g/m²N150p-X Gore-TexAround TownTrim960 g / 2 lb 1.9 oz80 cm / 31.5 inYes
Arc'teryx Cerium SV (Men's)0/-18ReviewNoNoYesDown850162137,700Coreloft80 + 140 g/m²Arato 7 & 10All RoundRegular415 g / 14.6 oz69.5 cm / 27.4 inYes
Arc'teryx Revet (Men's)2/-17NoYesNoParka750?N/AN/A20d nylon/spandex double weaveAround TownRegular755 g / 1 lb 10.6 oz91 cm / 36 inYes
Arc'teryx Piedmont (Men's)3/-16NoYesYesParka750218163,500N/AN/AArato 10Around TownRegular515 g / 1 lb 2.2 oz82 cm / 32.25 inYes
Arc'teryx Fission SV (Men's - Women's)3/-16ReviewNoYesNoSyntheticN/AN/AN/ACoreloft Continuous90 + 65 g/m²N80p-X Gore-Tex 2LAll RoundRegular890 g / 1 lb 15.4 oz81 cm / 31.8 inYes
Arc'teryx Alpha Lightweight (Men's)3/-16NoYesYesDown85011799,450Coreloft Compact40 g/m²Hadron 2L Gore-Tex InfiniumClimbingRegular540 g / 1 lb 3 oz?No
Outdoor Research Sup. Alp. (Men's - Women's)3/-16NoYesNoDown800182145,600N/AN/A30D Pertex Quantum ProAll RoundRegular825 g / 1 lb 13.1 oz85 cm / 33.5 inNo
Arc'teryx Alessa Long (Women's)3/-16NoNoNoParkaN/AN/AN/ACoreloft80 + 120 g/m²N90p 2L Gore-TexAround TownRegular1.015 kg / 2 lb 3.8 oz123 cm / 48.5 inYes
Patagonia Tres 3-in-1 (Men's - Women's)3/-16ReviewNoNoNoParka70011882,600N/AN/A5.5 oz polyesterAround TownRegular1.307 kg / 2 lb 14.1 oz85 cm / 33.5 inNo
Arc'teryx Radsten Parka (Men's)3/-16NoNoNoParkaN/AN/AN/ACoreloft Compact120 g/m²NP100d Gore-Tex 2LAround TownRegular745 g / 1 lb 10.3 oz82 cm / 32.25 inYes
Rab Electron Pro (Men's - Women's)5/-15NoYesYesDown800180144,000N/AN/A20D Pertex Quantum ProAll RoundRegular525 g / 1 lb 2.5 oz74 cm / 29 inNo
Arc'teryx Therme Parka (Men's)5/-15ReviewNoYesNoParka75012090,000Coreloft60 + 80 g/m²P75d PolyesterAround TownRegular991 g / 2 lb 3 oz85 cm / 33.5 inNo
Arc'teryx Macai (Men's)5/-15ReviewYes, zipsNoNoDown7506951,750Coreloft Compact60 + 100 g/m²N40p-X 3L Gore-TexSki/SnowboardRegular1 kg / 2 lb 4 oz76 cm / 30 inYes
Arc'teryx Nuclei SV (Men's)5/-15ReviewNoYesYesSyntheticN/AN/AN/ACoreloft Continuous180 g/m2 + 90 g/m2Arato 15ClimbingRegular600 g / 1 lb 5.2 oz81 cm / 31.8 inNo
Patagonia DAS Parka (Men's)5/-15NoYesYesParkaN/AN/AN/APrimaLoft Gold Insulation Eco133 + 40 gPertex Quantum ProAround TownRegular555 g / 1lb 3.6 oz84 cm / 33 inNo
Arc'teryx Patera (Women's)5/-15ReviewNoYesNoParka7505843,500Coreloft60 + 80 g/m²2L Gore-TexAround TownTrim867 g / 1 lb 14.6 oz99 cm / 39 inNo
Black Diamond Access Down (Men's - Women's)7/-14NoYesYesDown700155108,500N/AN/A30D ripstop nylonAll RoundRegular442 g / 15.6 oz76 cm / 29.75 inNo
Arc'teryx Kappa (Men's)7/-14ReviewNoYesNoSyntheticN/AN/AN/ACoreloft Continuous140 g/m²N70p Gore ThermiumAll RoundRegular755 g / 1 lb 10.6 oz80 cm / 31.5 inYes
Arc'teryx Prema Down Coat (Women's)7/-14NoYesNoParka7509269,000N/AN/ANylonAround TownRegular794 g / 1 lb 12 oz117 cm / 46.1 inYes
Arc'teryx Radsten Insulated (Men's)7/-14NoNoNoParkaN/AN/AN/ACoreloft Compact120 g/m²NP100d Gore-Tex 2LAround TownRegular715 g / 1 lb 9.2 oz73 cm / 28.75 inYes
Rab Microlight Alpine (Men's - Women's)7/-14NoNoYesDown700153107,100N/AN/A30D Pertex QuantumAll RoundRegular466 g / 1 lb 0.5 oz72 cm / 28.5 inNo
Arc'teryx Thorium (Men's - Women's)7/-14ReviewNoYesYesDown750140105,000Coreloft80 + 140 g/m²Arato 30All RoundRegular517 g / 1 lb 2.2 oz71.5 cm / 28.1 inNo
Feathered Friends Eos8/-13NoNoYesDown90010594,500N/AN/APertex QuantumAll RoundRegular306 g / 10.8 oz?No
Arc'teryx Thorium AR 2020 (Men's - Women's)8/-13ReviewNoNoYesDown75013097,500Coreloft80 + 140 g/m²Arato 30All RoundRegular490 g / 1 lb 1.3 oz72 cm / 28.3 inYes
Patagonia Macro Puff (Men's - Women's)8/-13ReviewNoNoNoSyntheticN/AN/AN/APlumaFill135 + 90 g10D Recycled nylon ripstopAll RoundRegular435 g / 15.3 oz79 cm / 31 inNo
Arc'teryx Macai LT (Men's)8/-13Yes, zipsNoNoDown7504936,750Coreloft Compact60 g/m²N40p-X 3L Gore-TexSki/SnowboardRegular855 g / 1 lb 14.2 oz74 cm / 29.1 inYes
Arc'teryx Seyla (Women's)8/-13NoYesNoParka7509269,000N/AN/AArato 10Around TownRegular507 g / 1 lb. 1.9 oz.87 cm / 34.4 inYes
Patagonia Fitz Roy (Men's - Women's)8/-13NoNoYesDown800128102,400N/AN/A20D NylonAll RoundRegular632 g / 1lb 6.3 oz74 cm / 29 inNo
Arc'teryx Koda (Men's)8/-13NoNoNoParkaN/AN/AN/ACoreloft80 + 140 g/m²N80p-X Gore-TexAround TownRegular720 g / 1 lb 9.4 oz75 cm / 29.5 inYes
Patagonia Vosque 3-in-1 (Women's)10/-12ReviewNoNoNoParkaN/AN/AN/AThermoLite100 g65% nylon, 35% polyesterAround TownRegular1.360 kg / 3 lb90 cm / 35.5 inNo
Patagonia City Storm Down (Men's - Women's)12/-11NoNoYesParka700191133,700N/AN/A4.2 oz polyesterAll RoundRegular468 g / 16.5 oz91 cm / 36 inNo
Patagonia Jackson Glacier (Men's - Women's)12/-11ReviewNoYesNoParka70014198,700N/AN/A3.6 oz 50D polyesterAround TownRegular880 g / 1 lb 15 oz79 cm / 31 inNo
Arc'teryx Sensa (Women's)14/-10NoYesNoParkaN/AN/AN/ACoreloft Compact120 g/m²NP100d Gore-Tex 2LAround TownRelaxed785 g / 1 lb 11.7 oz86 cm / 34 inYes
Patagonia Hi Loft Down (Men's - Women's)14/-10ReviewNoNoYesDown600177106,200N/AN/A1.4 oz 30D polyesterAll RoundRegular540 g / 1 lb 3 oz76 cm / 30 inNo
REI Magma 850 Hoodie 2.0 (Men's - Women's)14/-10NoNoYesDown850120102,000N/AN/APertex mini ripstop nylonAll RoundRegular340 g / 13.75 oz74 cm / 29.25 inNo
Arc'teryx Beta Insulated Coat (Women's)16/-9ReviewNoYesNoSyntheticN/AN/AN/ACoreloft 80 g/m² + 120 g/m²2L 40D Gore-TexAround TownRegular600 g / 1 lb 5.2 oz?No
Arc'teryx Atom Hw. (aka AR) (Men's - Women's)18/-8ReviewYes, meshNoNoSyntheticN/AN/AN/ACoreloft Continuous120 g/m2 + 80 g/m2 + 60 g/m230D TyonoAll RoundRegular475 g / 1 lb 74 cm / 29.1 inNo
Patagonia Downdrift (Men's - Women's)18/-8NoNoNoDown600279167,400N/AN/A4.2 oz polyesterAround TownRegular1.014 kg / 2 lb 3.8 oz?No
Arc'teryx Magnus (Men's)19/-7NoNoNoParkaN/AN/AN/ACoreloft80 gN60p Gore-Tex 2LAround TownRegular690 g / 1 lb 8.3 oz83 cm / 32.5 inYes
Arc'teryx Proton Hw. (Men's - Women's)21/-6ReviewNoNoNoSyntheticN/AN/AN/ACoreloft100 g/m2 + 60 g/m2Fortius Air 50ClimbingRegular540 g / 1 lb 3 oz77 cm / 30.5 inNo
Arc'teryx Agrium (Men's - Women's)21/-6NoNoYesDown85011799,450N/AN/AAratoAll RoundRegular365 g / 12.9 oz75 cm / 29.5 inYes
Patagonia AlpLight Down (Men's - Women's)21/-6NoNoYesDown80010080,000N/AN/A0.8 oz 10D polyesterAll RoundSlim270 g / 9.5 oz74 cm / 29 inNo
Arc'teryx Beta Insulated (Men's - Women's)21/-6ReviewYes, zipsYesNoSyntheticN/AN/AN/ACoreloft Continuous80 g/m²2L 40D Gore-TexAll RoundRegular680 g / 1 lb 8 oz78.5 cm / 31 inNo
Patagonia Topley (Men's)23/-5NoYesNoDown700172120,400N/AN/A6 oz polyesterAll RoundRegular1.133 kg / 2 lb 8 oz77 cm / 30.5 inNo
Arc'teryx Alpha IS (Men's)23/-5NoYesYesSyntheticN/AN/AN/ACoreloft Continuous65 g/m²N40p-X 2L Gore-TexClimbingRegular610 g / 1 lb 5.5 oz78 cm / 30.75 inYes
Rab Xenon 2.0 (Men's - Women's)23/-5NoYesYesSyntheticN/AN/AN/APrimaLoft Silver60 g30D Pertex QuantumAll RoundRegular385 g / 13.6 oz71.5 cm / 28.1 inNo
Patagonia Down Sweater (Men's - Women's)23/-5ReviewNoNoYesDown800150120,000N/AN/A1.4 oz 20x30D polyesterAll RoundRegular428 g / 15.1 oz67 cm / 26.25 inNo
Arc'teryx Ralle Parka (Men's)25/-4NoYesNoParkaN/AN/AN/ACoreloft 80 g/m²2L 40D Gore-TexAround TownRegular735 g / 1 lb 9.9 oz83 cm / 32.5 inNo
Patagonia Silent Down (Men's - Women's)26/-3ReviewNoNoNoDown70010976,300N/AN/A2.2 oz polyesterAround TownRegular585 g / 1 lb 4.7 oz74 cm / 29 inNo
Arc'teryx Therme Insulated (Men's)26/-3ReviewNoNoNoSyntheticN/AN/AN/ACoreloft Compact40 g/m²2L Gore-TexAround TownRegular960 g / 2 lb 1.9 oz73 cm / 28.75 inYes
Arc'teryx Cerium (aka LT) (Men's - Women's)26/-3NoNoYesDown85011396,050Coreloft 80 + 100 g/m²Arato 15All RoundTrim335 g / 11.8 oz72 cm / 28.3 inNo
Mountain Hardwear GW/2 (Men's - Women's)28/-2NoNoYesDown8008568,000N/AN/A10D Ripstop NylonAll RoundTrim250 g / 8.8 oz70 cm / 27.5 inNo
Arc'teryx Cerium LT 2020 (Men's - Women's)28/-2ReviewNoNoYesDown85010286,700Coreloft 80 + 100 g/m²Arato 10All RoundTrim305 g / 10.8 oz72 cm / 28.3 inYes
Arc'teryx Nuclei (aka FL) (Men's - Women's)32/0ReviewNoNoYesSyntheticN/AN/AN/ACoreloft Continuous65 g/m²Arato 10rClimbingTrim325 g / 11.5 oz75 cm / 29.5 inNo
Patagonia DAS Light (Men's - Women's)34/1NoYesYesSyntheticN/AN/AN/APlumaFill65 g0.8-oz 10-denier Pertex Quantum ProClimbingRegular320 g / 11.3 oz77 cm / 30.5 inNo
Patagonia Isthmus (Men's)36/2NoNoNoParkaN/AN/AN/AThermoGreen60 g4.2 oz polyesterAround TownRegular895 g / 1 lb 15.6 oz70 cm / 27.5 inNo
Arc'teryx Proton (aka LT) (Men's - Women's)37/3ReviewNoNoNoSyntheticN/AN/AN/ACoreloft Compact80 g/m2 + 60 g/m2Fortius Air 20ClimbingTrim375 g / 13.2 oz75 cm / 29.4 inNo
Patagonia Nano Puff (Men's - Women's)37/3ReviewNoNoYesSyntheticN/AN/AN/APrimaLoft Gold Insulation Eco60 g22D PolyesterAll RoundRegular363 g / 12.8 oz71.5 cm / 28 inNo
Arc'teryx Norvan SL Ins. (Men's - Women's)39/4NoNoYesSyntheticN/AN/AN/ACoreloft Compact40 g/m²Gore-Tex ShakeDryRunningTrim270 g / 9.5 oz71.5 cm / 28.1 inYes
Patagonia Micro Puff (Men's - Women's)41/5ReviewNoNoYesSyntheticN/AN/AN/APlumaFill65 gPertex QuantumAll RoundRegular298 g / 10.5 oz75 cm / 29.5 inNo
Patagonia Nano Air (Men's - Women's)41/5ReviewNoNoNoSyntheticN/AN/AN/AFullRange60 g33D Nylon ripstopAll RoundTrim318 g / 11.2 oz?No
Arc'teryx Atom (aka LT) (Men's - Women's)43/6ReviewYes, meshNoNoSyntheticN/AN/AN/ACoreloft Continuous60 g/m²20D TyonoAll RoundTrim375 g / 13.2 oz74 cm / 29.1 inNo
Arc'teryx Cerium Lw. (aka SL) (Men's - Women's)43/6ReviewNoNoYesDown8505849,300Coreloft 40 + 100 g/m²Arato 7All RoundTrim215 g / 7.6 oz69 cm / 27.2 in No
Arc'teryx Cerium Hybrid (Men's)44/7NoNoYesDown8504437,400Coreloft 40 + 100 g/m²Arato 15 + Fortius Air 50All RoundTrim260 g / 9.2 oz70 cm / 27.5 inNo
Arc'teryx Proton Hybrid (Men's - Women's)46/8ReviewNoNoNoSyntheticN/AN/AN/ACoreloft Compact40 g/m²Fortius Air 50All RoundTrim365 g / 12.9 oz76 cm / 30 inNo
Arc'teryx Proton Lw. (aka FL) (Men's - Women's)48/9ReviewNoNoNoSyntheticN/AN/AN/AOcta Loft94 g/m²Fortius Air 20ClimbingTrim343 g / 12.1 oz75 cm / 29.5 inNo
Arc'teryx Atom Lw. (aka SL) (Men's - Women's)52/11ReviewYes, meshNoNoSyntheticN/AN/AN/ACoreloft Compact40 g/m²20D TyonoAll RoundTrim270 g / 9.5 oz72 cm / 28.3 inNo
REI Stormhenge Hybrid (Men's - Women's)TestingYes, zipsNoNoDown850?N/AN/A40D + 80DAll RoundRegular900 g / 1 lb 15.75 oz80 cm / 31.5 inNo
Arc'teryx Coelle Parka (Women's)TestingNoYesNoParkaN/AN/AN/ACoreloft80 + 140 g/m²40D 2L Gore-TexAround TownRegular460 g / 1 lb 0.2 oz95 cm / 37.4 inNo
Sabre Insulated (Men's)TestingYes, zipsYesNoSyntheticN/AN/AN/AN/ACoreloft60 + 80 g/m²Fortius Air 50Regular535g / 1 lb 2.9 oz?No

Find the estimated average lowest temperature ratings you can wear each jacket above, assuming: 

  • you only have a shirt under and no shell over, 
  • you're walking, 
  • it's a bit windy and there's no precipitation. 

If you think you run warmer or colder than the average person, then shift these ratings accordingly. 

Also,

  • Always opt for the warmer option when in doubt. 
  • Ratings will best respond to men's physiology. As most women tend to run colder than men, for women, bumping each rating by 10 - 20 deg F (5 - 10 deg C) is recommended. 
  • Ratings are applicable to your torso and arms only. In colder weather (below, say, 20 deg F (-6 deg C)), it becomes much harder to keep your hands, feet and head warm rather than your torso and arms. 
    • This is why getting beanies, gloves and socks are game changers in this regard. 
  • Further reading: 
    • CLO values of synthetic insulators: https://outdoorcrunch.com/clo-values/
    • Guide to Arc'teryx Jackets: https://outdoorcrunch.com/best-arcteryx-jacket/
    • Guide to Patagonia Jackets: https://outdoorcrunch.com/best-patagonia-jackets/
  • Also see:
    • Arc'teryx Jacket Finder: https://arcteryx.com/us/en/shop/jacket-finder

As you see, there's a strong correlation between FP x FW and temperature ratings, but not more than, say, 80%. I explained why this happens here in this post of mine. 

Most companies will claim that providing temperature ratings isn't possible.

And they're not incorrect. There are tons of fluid parameters that are difficult to measure if not impossible. Not to even mention the subjective nature of the feeling of warmth. 

Having said that... 

It is possible to provide approximate values for an average person making some strict assumptions around layering and weather conditions. 

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  • #A sidenote here: Arc'teryx's PDF guide to jackets is GOOOLLLLDDDDD. Absolutely check that out too if you're interested in buying one. 

Which is what you'll find out in this post. 

Insulated Jackets: Temperature Ratings
Summary
Understanding the Working Principle of Down Insulated Jackets
Fill Power
Other roles of fill power
Fill Weight
Warmth Calculation
Understanding the Working Principle of Synthetic Insulated Jackets
CLO values
Warmth Evaluation
Other factors
Bagginess
Length
Outer fabric 
Fill distribution
Reinforcements
Results: Temperature Ratings

The context of this study will be evaluated in two parts: 

  • Working principles of down jackets, 
  • Working principles of synthetic insulated jackets. 

Let's get to it. 

Understanding the Working Principle of Down Insulated Jackets

Down quality and down amount are the two most important things when it comes to the ultimate warmth provided by any down insulated garment. 

You'll mostly come across this as fill power and fill weight respectively. 

Because the word "down" is typically referred to as "fill" within the language of down pieces. 

Let's take a look at the former first. 

Fill Power

Fill Power represents the fully expanded, end volume of a 1 oz down (goose or duck). It's in cubic inches. 

For example, a 800 FP (fill power) down will end up getting 800 cubic inches when it's fully expanded. 

  • How and why does a higher FP down offers higher warmth?

Because the insulation occurs by trapping air within the vacant spots of down, followed by having that air heated using our body heat as the source. 

So, the higher the volume of trapped air (which is directly proportional with Fill Power), the more air will be heated & work as insulation as a result. 

Fill power. 

In the end, you'll feel warmer inside the jacket you're wearing. 

This number varies anywhere from 500 to 1000, although the majority of quality brands (such as Arc'teryx, Patagonia, Feathered Friends, Outdoor Research, Marmot, REI Co-op, Enlightened Equipment, Rab, Black Diamond, Mountain Equipment and Mountain Hardwear)...

...mostly use down between 650 FP and 850 FP. 

As you'll see, there are outliers, though. A notable one would be Feathered Friends Eos, which is equipped with a whooping 900 FP down. 

Now before we get to fill weight, speaking of fill power...

...warmth actually isn't the only thing that it affects. 

Other roles of fill power

It has additional three important roles: 

  • Loft retention during movement: Higher FP down will retain its loft with minimal loss during movement. The lower the FP, the larger the loss in this department. 
  • Higher impact on end warmth: Compared to FW (fill weight), FP has a larger impact on the warmth the insulated jacket provides. 

For the sake of minimizing confusion and keeping this as clear as possible, equal weights of importance are placed on fill power and fill weight when calculating FP * FW values (which you'll come across as you read on). 

...although these effects has been included when calculating the temperature ratings of jackets within their first year. 

After all, FP * FW is not the only factor considered while laying out the temperature ratings. 

Tens of parameters are assessed, and the values put together at the end are the final results, including the few extra effects of fill power. 

  • Durability of insulation capability 
    • A jacket with a higher FP down minimizes its loss of insulating power over time. You'd be able to use a 850 FP down jacket for decades, and it'd feel almost just as warm as the first day you put it on. 
    • A jacket with a lower FP down, on the other hand, might not and probably will not prove nearly as durable. In our experiences, jackets equipped with 650 FP down are more likely to feel noticeably colder after, say, 2-3 years. 

If you, on the other hand, are not planning to use your jacket for more than a few years, then this might not be that important to you after all. 

By the time it starts to lose its insulating power noticeably, you'll have gotten yourself a new piece anyway. 

  • Compressibility: A jacket with a higher FP down will offer a smaller packed size. 

Here's a video that also does a good job explaining fill power: 

Moving on to our other major factor... 

Fill Weight

Fill weight is the total amount of down the jacket is equipped with. 

Some other resources might claim that fill weight is much less important than fill power when it comes to warmth, but that's far from reality.

In terms of warmth, fill weight is very, very important. Almost (in some conditions it even is) just as important as fill power. 

Because, just like fill power, fill weight also directly affects the total amount of air trapped within the vacant spots of down. 

Warmth Calculation

So... 

As explained earlier, fill power and fill weight are the two most important factors when it comes to warmth. 

In many cases, on a larger scale, assuming both jackets are equipped with the same amount of equally capable synthetic insulation, it is possible to make very close estimations by multiplying them when comparing warmth ratings of two different pieces. 

For example...

  • Arc'teryx Cerium SV offers 162 grams of 850 FP down. 
    • 105*900 = 137,700
  • Rab Positron Pro offers 300 grams of 800 FP down. 
    • 116*650 = 240,000

Since 240,000 is significantly greater than 137,700; it's safe to say that the former will be noticeably warmer than the latter. 

One point should be made in here is that although the Positron will come warmer, thanks to the higher FP down of Cerium SV: 

  • it'll stay almost equally warm even after decades, 
  • it won't lose its insulation during movement, 
  • and it's quite a bit compressible. 

Now... 

There are reasons why this mostly won't work on a smaller scale (more on these later, under Other Factors heading). 

  • What do you mean by smaller scale?

Comparing two jackets with, say, 140,000 and 100,000 FP * FW values. 

Understanding the Working Principle of Synthetic Insulated Jackets

Synthetic insulated jackets imitate the working principle of down insulated jackets. They're equipped with artificial insulators, rather than natural down obtained by geese and ducks.

Some examples to the names of these artificial insulators can be given as Coreloft and PlumaFill. Comparing the temperature ratings of synthetic insulated jackets is more difficult. 

Because, unlike fill power parameter in down jackets, there isn't a common denominator to compare different types of synthetic insulators in an analytical way. 

Maybe except one parameter? 

CLO values

CLO value is the insulation power of an insulation setting.

For example, this value is 0.92 for 1 oz (28.35 grams) of a dry PrimaLoft One for one square yard. The important thing here is that unlike fill power, CLO is not a characteristic that is unique to one ounce of the material.

As you see in the example above, it isn't independent from the area of insulation (square yards). 

So, a higher CLO actually points out to the insulation capability of an insulation setting as a whole. It does NOT necessarily mean that the insulator being used is any more capable than an insulation setting put together with a weaker insulator. 

Given the right amount of thickness, any insulator can achieve desired CLO value. It's just going to end up being heavier. So, metaphorically, you can think of CLO value in synthetic insulated jackets as FP * FW value in down insulated jackets. 

  • Read more about CLO values: https://outdoorcrunch.com/clo-values/ 

Unfortunately, obtaining the CLO value for commercial products is absolutely impossible. 

Having said that... 

We can (and we do) use a made-up parameter to CLO/oz/yd² to replicate FP in down jackets. 

Honehstein Institute certified. A quick recap here: As you see, synthetic insulators lose minimal insulating power when they get wet. Down, on the other hand, loses a lot of it. 

But unfortunately, a new problem arises here. A fair amount of manufacturers come up with their unique insulators - such as Coreloft, PlumaFill, Octa, Stratus, FullRange, etc. 

And just like CLO values, they're unwilling to reveal the CLO/oz/yd² values of their insulators too. Which are the numbers we would need to determine the warmth. 

I asked Arc'teryx and Patagonia Customer Services myself about this, and came back empty handed. 

Having said that... 

During my research, I did come across some useful information that I can leverage. For example, as it turns out, the CLO/oz/yd² value for PrimaLoft One is 0.92. It's also 0.79 for PrimaLoft Sport and 0.74 for PrimaLoft Eco. 

However... 

These values aren't certain or completely trustworthy by any means. They aren't the results of scientific studies. I didn't detect them in any other place rather than forums, Reddit, or contacting manufacturers myself. 

In the end, I put what I could find together and did my best to make an estimation. Fortunately, this calculation using the numerical value CLO was not the only information I had in my hands. 

I had two additional (at least equally helpful) data: trying them out myself when I could, and gathering offline user experience. 

Warmth Evaluation

So, in the end, I used at least two of these three items to estimate the overall temperature rating of an insulated jacket: 

  • Analyzed them scientifically (as explained earlier), 
  • Trying them out myself when I can, 
  • And/or gathering offline user experience. 

And mostly all three above. 


In addition to insulation types and amounts (which is what I covered so far), there are also other factors that impact the warmth of an insulated jacket. 

Other factors

Let's talk about the most important and most common examples of these factors.

In most cases, these are considered minor next to insulation specific qualities. But they do have a noticeable effect, and combined together, they might come close to affect the warmth as much as the insulator capability and amount. 

  • Bagginess,
  • Length,
  • Outer fabric,
  • Distribution of insulation. 

Bagginess

I also talked about this more in my my Arc'teryx Thorsen vs Therme vs Camosun post. 

Baggier cut of Cerium SV helps with its incredible warmth. 

Briefly, the amount of trapped air increases as the jacket gets baggier. So more air works as insulation, and ultimately you're kept warmer. 

There certainly is something as "too baggy", though. After some point, more inner volume only holds the warmth back. 

Length

This has two effects.

First one is that the amount of trapped air, which is explained above.

And second, in colder weather, it becomes much harder to warm your legs and feet than your torso and arms. 

This is why a jacket with a longer hem length will feel warmer. And the difference is pretty noticeable. 

Outer fabric 

Outer fabric is actually much more about weather resistance, but it also affects warmth a little bit. 

As explained earlier, no down jacket is able to offer top notch weather resistance since they get clumped and lose their loft when they get wet. Either from your sweat or from weather conditions. Doesn't matter. 

Having said that, it's still possible to prevent it to a certain degree. Some products offer a more fragile face fabric, while others can bead water more efficiently. These are directly proportional to face quality and DWR coating. 

  • What is DWR by the way?

DWR is a coating. 

It's basically sprayed on to the surface of these jackets as a finish. It stands for Durable Water Repellent - which means that water will be repelled under wet conditions instead of soaking into the fabric. 

DWR also decreases dry time. 

It's a good thing these jackets are coated in DWR, but pay attention to the fact that DWR is a coating - meaning that it will wear off over time. 

Which is why you might want to invest in a DWR spray such as this one for after treatment. 

As you see, there's a strong correlation between FP x FW and temperature ratings, but not more than, say, 80%. I explained why this happens here in this post of mine. 

For face fabrics, I'd list them like this: 

Perfex Quantum Pro = Arato 30 > Perfex Quantum > Arato 10 = Drilite Loft 40D > Arato 7 = Drilite Loft 20D > others.

For synthetic jackets, outer fabric affects the warmth noticeably less. 

Fill distribution

Some products of my favorite brand Arc'teryx are guilty of this. Take Firebee AR (read my review), for example. Nothing is wrong with the insulation at the back, collar and torso. They feel perfectly warm. 

Whereas the insulation in arms, especially in lower arms, are seemingly slightly inadequate, which in the end affects the warmth feeling a little bit. 

Reinforcements

Some (most?) down jackets are reinforced with synthetic insulation in strategical locations. More often than not, these are high wear areas such as shoulders, back, elbows, etc.

For the sake of simplicity, I don't list them in my tables - although I do take them into consideration when evaluating the end warmth of a jacket. 

This is why you can see a jacket with smaller FP x FW rating outscoring a jacket with higher FP x FW rating. Because the former is equipped with (more) synthetic insulation reinforcements. 

Results: Temperature Ratings

Down jackets lose insulating power noticeably when it gets wet. Synthetic jackets don't. This is why the dry weather assumption was made for both of them. 

  • Temperature Ratings of Insulated Jackets

NameEst. Temp (F/C)ReviewPit venting?Two way zipper?Stuffs into itself?TypeFill PowerFill Weight (grams)Fill Volume (FP x FW)Synthetic Insulator (SI)SI AmountFace FabricActivityFitWeightLength (CB)Discontinued?
Arc'teryx Alpha (Men's - Women's)-18/-28ReviewNoYesYesDown850296251,600Coreloft90 g/m²N30r 2L GoreTex InfiniumClimbingRegular805 g / 1 lb 12.4 oz86 cm / 34 inNo
Feathered Friends Khumbu-17/-27NoNoYesDown900378340,200Primaloft Gold200 gPretex Shield XTAll RoundRegular960 g / 2 lb 2 oz?No
Arc'teryx Ceres SV (Men's - Women's)-15/-26ReviewNoYesYesDown850240204,000Coreloft?Arato 30All RoundRegular880 g / 1 lb 15 oz86 cm / 34 inYes
Mountain Equipment K7 (Men's)-13/-25NoYesYesDown800300240,000N/AN/A30D DriliteAll RoundRegular820 g / 1 lb 13 oz76 cm / 30 inNo
Rab Positron Pro (Men's)-13/-25NoYesYesDown800300240,000N/AN/A40D Pertex Quantum ProAll RoundRegular740 g / 1 lb 10 oz85 cm / 33.5 inNo
Arc'teryx Therme SV (Men's)-11/-24ReviewNoYesNoParka750211158,250Coreloft60 g/m²2L Gore-TexAround TownRegular1.072 kg / 2 lb 5.8 oz96 cm / 37.75 inNo
Patagonia Grade VII (Men's)-11/-24NoYesNoDown800335268,000N/AN/A1.2 oz 15 & 20D Perfex QuantumAround TownRegular743 g / 1 lb 10.1 oz83 cm / 32.5 inNo
Arc'teryx Firebee AR (Men's - Women's)-10/-23ReviewNoYesYesDown800225180,000N/AN/AArato 7 & 10All RoundRegular680 g / 1 lb 8 oz79 cm / 31 inYes
Mountain Equipment Exo (Men's)-10/-23NoYesYesDown800265212,000N/AN/ANylonAll RoundRegular770 g / 1 lb 11.2 oz79 cm / 31 inNo
Arc'teryx Thorsen (Men's)-7/-22ReviewNoYesNoParka750192144,000Coreloft60 g/m²90D 2L Gore-TexAround TownRegular1.1 kg / 2 lb 5.4 oz91 cm / 36 inYes
Patagonia Frozen Range (Men's - Women's)-6/-21ReviewNoNoNoParka700268187,600N/AN/A4 oz 75-denier polyesterAround TownRegular1.253 kg / 2 lb 12.2 oz84 cm / 33 inNo
Mountain Equipment Li. Ec. (Men's - Women's)-5/-20NoYesNoDown700295206,500N/AN/A50D DriliteAll RoundRegular822 g / 1 lb 13 oz72 cm / 28 inNo
Arc'teryx Thorium Parka (Women's)-2/-19ReviewNoYesNoParka750209156,750Coreloft80 + 140 g/m²Arato 20Around TownRegular610 g / 1 lb 5.5 oz115.8 cm/ 45.6 inNo
Rab Neutrino Pro (Men's - Women's)-2/-19NoYesYesDown800212169,600N/AN/A20D Pertex Quantum ProAll RoundRegular585 g / 1 lb 8.6 oz77 cm / 30.3 inNo
Arc'teryx Patera Long (Women's)0/-18NoYesNoParka750204153,000Coreloft60 + 80 g/m²2L Gore-TexAround TownRegular1.1 kg / 2 lb 6.8 oz117.5 cm / 46.25 inNo
Arc'teryx Beta Down Insulated (Men's)0/-18YesYesNoParka850126107,100Coreloft80 g/m²2L 40D Gore-TexAll RoundRegular760 g / 1 lb 10.8 oz?No
Arc'teryx Dually Belay (Men's)0/-18ReviewNoYesYesSyntheticN/AN/AN/AThermaTek92 g/m²30D NylonAround TownRegular705 g / 1 lb 9 oz84 cm / 33 inYes
Arc'teryx Centrale (Women's)0/-18ReviewNoYesNoParka750157117,750Coreloft60 g/m²N90p NylonAround TownRegular885 g / 1 lb 15.2 oz95 cm / 37.5 inYes
Arc'teryx Camosun (Men's)0/-18ReviewNoNoNoParka75010578,750Coreloft140 g/m²N150p-X Gore-TexAround TownTrim960 g / 2 lb 1.9 oz80 cm / 31.5 inYes
Arc'teryx Cerium SV (Men's)0/-18ReviewNoNoYesDown850162137,700Coreloft80 + 140 g/m²Arato 7 & 10All RoundRegular415 g / 14.6 oz69.5 cm / 27.4 inYes
Arc'teryx Revet (Men's)2/-17NoYesNoParka750?N/AN/A20d nylon/spandex double weaveAround TownRegular755 g / 1 lb 10.6 oz91 cm / 36 inYes
Arc'teryx Piedmont (Men's)3/-16NoYesYesParka750218163,500N/AN/AArato 10Around TownRegular515 g / 1 lb 2.2 oz82 cm / 32.25 inYes
Arc'teryx Fission SV (Men's - Women's)3/-16ReviewNoYesNoSyntheticN/AN/AN/ACoreloft Continuous90 + 65 g/m²N80p-X Gore-Tex 2LAll RoundRegular890 g / 1 lb 15.4 oz81 cm / 31.8 inYes
Arc'teryx Alpha Lightweight (Men's)3/-16NoYesYesDown85011799,450Coreloft Compact40 g/m²Hadron 2L Gore-Tex InfiniumClimbingRegular540 g / 1 lb 3 oz?No
Outdoor Research Sup. Alp. (Men's - Women's)3/-16NoYesNoDown800182145,600N/AN/A30D Pertex Quantum ProAll RoundRegular825 g / 1 lb 13.1 oz85 cm / 33.5 inNo
Arc'teryx Alessa Long (Women's)3/-16NoNoNoParkaN/AN/AN/ACoreloft80 + 120 g/m²N90p 2L Gore-TexAround TownRegular1.015 kg / 2 lb 3.8 oz123 cm / 48.5 inYes
Patagonia Tres 3-in-1 (Men's - Women's)3/-16ReviewNoNoNoParka70011882,600N/AN/A5.5 oz polyesterAround TownRegular1.307 kg / 2 lb 14.1 oz85 cm / 33.5 inNo
Arc'teryx Radsten Parka (Men's)3/-16NoNoNoParkaN/AN/AN/ACoreloft Compact120 g/m²NP100d Gore-Tex 2LAround TownRegular745 g / 1 lb 10.3 oz82 cm / 32.25 inYes
Rab Electron Pro (Men's - Women's)5/-15NoYesYesDown800180144,000N/AN/A20D Pertex Quantum ProAll RoundRegular525 g / 1 lb 2.5 oz74 cm / 29 inNo
Arc'teryx Therme Parka (Men's)5/-15ReviewNoYesNoParka75012090,000Coreloft60 + 80 g/m²P75d PolyesterAround TownRegular991 g / 2 lb 3 oz85 cm / 33.5 inNo
Arc'teryx Macai (Men's)5/-15ReviewYes, zipsNoNoDown7506951,750Coreloft Compact60 + 100 g/m²N40p-X 3L Gore-TexSki/SnowboardRegular1 kg / 2 lb 4 oz76 cm / 30 inYes
Arc'teryx Nuclei SV (Men's)5/-15ReviewNoYesYesSyntheticN/AN/AN/ACoreloft Continuous180 g/m2 + 90 g/m2Arato 15ClimbingRegular600 g / 1 lb 5.2 oz81 cm / 31.8 inNo
Patagonia DAS Parka (Men's)5/-15NoYesYesParkaN/AN/AN/APrimaLoft Gold Insulation Eco133 + 40 gPertex Quantum ProAround TownRegular555 g / 1lb 3.6 oz84 cm / 33 inNo
Arc'teryx Patera (Women's)5/-15ReviewNoYesNoParka7505843,500Coreloft60 + 80 g/m²2L Gore-TexAround TownTrim867 g / 1 lb 14.6 oz99 cm / 39 inNo
Black Diamond Access Down (Men's - Women's)7/-14NoYesYesDown700155108,500N/AN/A30D ripstop nylonAll RoundRegular442 g / 15.6 oz76 cm / 29.75 inNo
Arc'teryx Kappa (Men's)7/-14ReviewNoYesNoSyntheticN/AN/AN/ACoreloft Continuous140 g/m²N70p Gore ThermiumAll RoundRegular755 g / 1 lb 10.6 oz80 cm / 31.5 inYes
Arc'teryx Prema Down Coat (Women's)7/-14NoYesNoParka7509269,000N/AN/ANylonAround TownRegular794 g / 1 lb 12 oz117 cm / 46.1 inYes
Arc'teryx Radsten Insulated (Men's)7/-14NoNoNoParkaN/AN/AN/ACoreloft Compact120 g/m²NP100d Gore-Tex 2LAround TownRegular715 g / 1 lb 9.2 oz73 cm / 28.75 inYes
Rab Microlight Alpine (Men's - Women's)7/-14NoNoYesDown700153107,100N/AN/A30D Pertex QuantumAll RoundRegular466 g / 1 lb 0.5 oz72 cm / 28.5 inNo
Arc'teryx Thorium (Men's - Women's)7/-14ReviewNoYesYesDown750140105,000Coreloft80 + 140 g/m²Arato 30All RoundRegular517 g / 1 lb 2.2 oz71.5 cm / 28.1 inNo
Feathered Friends Eos8/-13NoNoYesDown90010594,500N/AN/APertex QuantumAll RoundRegular306 g / 10.8 oz?No
Arc'teryx Thorium AR 2020 (Men's - Women's)8/-13ReviewNoNoYesDown75013097,500Coreloft80 + 140 g/m²Arato 30All RoundRegular490 g / 1 lb 1.3 oz72 cm / 28.3 inYes
Patagonia Macro Puff (Men's - Women's)8/-13ReviewNoNoNoSyntheticN/AN/AN/APlumaFill135 + 90 g10D Recycled nylon ripstopAll RoundRegular435 g / 15.3 oz79 cm / 31 inNo
Arc'teryx Macai LT (Men's)8/-13Yes, zipsNoNoDown7504936,750Coreloft Compact60 g/m²N40p-X 3L Gore-TexSki/SnowboardRegular855 g / 1 lb 14.2 oz74 cm / 29.1 inYes
Arc'teryx Seyla (Women's)8/-13NoYesNoParka7509269,000N/AN/AArato 10Around TownRegular507 g / 1 lb. 1.9 oz.87 cm / 34.4 inYes
Patagonia Fitz Roy (Men's - Women's)8/-13NoNoYesDown800128102,400N/AN/A20D NylonAll RoundRegular632 g / 1lb 6.3 oz74 cm / 29 inNo
Arc'teryx Koda (Men's)8/-13NoNoNoParkaN/AN/AN/ACoreloft80 + 140 g/m²N80p-X Gore-TexAround TownRegular720 g / 1 lb 9.4 oz75 cm / 29.5 inYes
Patagonia Vosque 3-in-1 (Women's)10/-12ReviewNoNoNoParkaN/AN/AN/AThermoLite100 g65% nylon, 35% polyesterAround TownRegular1.360 kg / 3 lb90 cm / 35.5 inNo
Patagonia City Storm Down (Men's - Women's)12/-11NoNoYesParka700191133,700N/AN/A4.2 oz polyesterAll RoundRegular468 g / 16.5 oz91 cm / 36 inNo
Patagonia Jackson Glacier (Men's - Women's)12/-11ReviewNoYesNoParka70014198,700N/AN/A3.6 oz 50D polyesterAround TownRegular880 g / 1 lb 15 oz79 cm / 31 inNo
Arc'teryx Sensa (Women's)14/-10NoYesNoParkaN/AN/AN/ACoreloft Compact120 g/m²NP100d Gore-Tex 2LAround TownRelaxed785 g / 1 lb 11.7 oz86 cm / 34 inYes
Patagonia Hi Loft Down (Men's - Women's)14/-10ReviewNoNoYesDown600177106,200N/AN/A1.4 oz 30D polyesterAll RoundRegular540 g / 1 lb 3 oz76 cm / 30 inNo
REI Magma 850 Hoodie 2.0 (Men's - Women's)14/-10NoNoYesDown850120102,000N/AN/APertex mini ripstop nylonAll RoundRegular340 g / 13.75 oz74 cm / 29.25 inNo
Arc'teryx Beta Insulated Coat (Women's)16/-9ReviewNoYesNoSyntheticN/AN/AN/ACoreloft 80 g/m² + 120 g/m²2L 40D Gore-TexAround TownRegular600 g / 1 lb 5.2 oz?No
Arc'teryx Atom Hw. (aka AR) (Men's - Women's)18/-8ReviewYes, meshNoNoSyntheticN/AN/AN/ACoreloft Continuous120 g/m2 + 80 g/m2 + 60 g/m230D TyonoAll RoundRegular475 g / 1 lb 74 cm / 29.1 inNo
Patagonia Downdrift (Men's - Women's)18/-8NoNoNoDown600279167,400N/AN/A4.2 oz polyesterAround TownRegular1.014 kg / 2 lb 3.8 oz?No
Arc'teryx Magnus (Men's)19/-7NoNoNoParkaN/AN/AN/ACoreloft80 gN60p Gore-Tex 2LAround TownRegular690 g / 1 lb 8.3 oz83 cm / 32.5 inYes
Arc'teryx Proton Hw. (Men's - Women's)21/-6ReviewNoNoNoSyntheticN/AN/AN/ACoreloft100 g/m2 + 60 g/m2Fortius Air 50ClimbingRegular540 g / 1 lb 3 oz77 cm / 30.5 inNo
Arc'teryx Agrium (Men's - Women's)21/-6NoNoYesDown85011799,450N/AN/AAratoAll RoundRegular365 g / 12.9 oz75 cm / 29.5 inYes
Patagonia AlpLight Down (Men's - Women's)21/-6NoNoYesDown80010080,000N/AN/A0.8 oz 10D polyesterAll RoundSlim270 g / 9.5 oz74 cm / 29 inNo
Arc'teryx Beta Insulated (Men's - Women's)21/-6ReviewYes, zipsYesNoSyntheticN/AN/AN/ACoreloft Continuous80 g/m²2L 40D Gore-TexAll RoundRegular680 g / 1 lb 8 oz78.5 cm / 31 inNo
Patagonia Topley (Men's)23/-5NoYesNoDown700172120,400N/AN/A6 oz polyesterAll RoundRegular1.133 kg / 2 lb 8 oz77 cm / 30.5 inNo
Arc'teryx Alpha IS (Men's)23/-5NoYesYesSyntheticN/AN/AN/ACoreloft Continuous65 g/m²N40p-X 2L Gore-TexClimbingRegular610 g / 1 lb 5.5 oz78 cm / 30.75 inYes
Rab Xenon 2.0 (Men's - Women's)23/-5NoYesYesSyntheticN/AN/AN/APrimaLoft Silver60 g30D Pertex QuantumAll RoundRegular385 g / 13.6 oz71.5 cm / 28.1 inNo
Patagonia Down Sweater (Men's - Women's)23/-5ReviewNoNoYesDown800150120,000N/AN/A1.4 oz 20x30D polyesterAll RoundRegular428 g / 15.1 oz67 cm / 26.25 inNo
Arc'teryx Ralle Parka (Men's)25/-4NoYesNoParkaN/AN/AN/ACoreloft 80 g/m²2L 40D Gore-TexAround TownRegular735 g / 1 lb 9.9 oz83 cm / 32.5 inNo
Patagonia Silent Down (Men's - Women's)26/-3ReviewNoNoNoDown70010976,300N/AN/A2.2 oz polyesterAround TownRegular585 g / 1 lb 4.7 oz74 cm / 29 inNo
Arc'teryx Therme Insulated (Men's)26/-3ReviewNoNoNoSyntheticN/AN/AN/ACoreloft Compact40 g/m²2L Gore-TexAround TownRegular960 g / 2 lb 1.9 oz73 cm / 28.75 inYes
Arc'teryx Cerium (aka LT) (Men's - Women's)26/-3NoNoYesDown85011396,050Coreloft 80 + 100 g/m²Arato 15All RoundTrim335 g / 11.8 oz72 cm / 28.3 inNo
Mountain Hardwear GW/2 (Men's - Women's)28/-2NoNoYesDown8008568,000N/AN/A10D Ripstop NylonAll RoundTrim250 g / 8.8 oz70 cm / 27.5 inNo
Arc'teryx Cerium LT 2020 (Men's - Women's)28/-2ReviewNoNoYesDown85010286,700Coreloft 80 + 100 g/m²Arato 10All RoundTrim305 g / 10.8 oz72 cm / 28.3 inYes
Arc'teryx Nuclei (aka FL) (Men's - Women's)32/0ReviewNoNoYesSyntheticN/AN/AN/ACoreloft Continuous65 g/m²Arato 10rClimbingTrim325 g / 11.5 oz75 cm / 29.5 inNo
Patagonia DAS Light (Men's - Women's)34/1NoYesYesSyntheticN/AN/AN/APlumaFill65 g0.8-oz 10-denier Pertex Quantum ProClimbingRegular320 g / 11.3 oz77 cm / 30.5 inNo
Patagonia Isthmus (Men's)36/2NoNoNoParkaN/AN/AN/AThermoGreen60 g4.2 oz polyesterAround TownRegular895 g / 1 lb 15.6 oz70 cm / 27.5 inNo
Arc'teryx Proton (aka LT) (Men's - Women's)37/3ReviewNoNoNoSyntheticN/AN/AN/ACoreloft Compact80 g/m2 + 60 g/m2Fortius Air 20ClimbingTrim375 g / 13.2 oz75 cm / 29.4 inNo
Patagonia Nano Puff (Men's - Women's)37/3ReviewNoNoYesSyntheticN/AN/AN/APrimaLoft Gold Insulation Eco60 g22D PolyesterAll RoundRegular363 g / 12.8 oz71.5 cm / 28 inNo
Arc'teryx Norvan SL Ins. (Men's - Women's)39/4NoNoYesSyntheticN/AN/AN/ACoreloft Compact40 g/m²Gore-Tex ShakeDryRunningTrim270 g / 9.5 oz71.5 cm / 28.1 inYes
Patagonia Micro Puff (Men's - Women's)41/5ReviewNoNoYesSyntheticN/AN/AN/APlumaFill65 gPertex QuantumAll RoundRegular298 g / 10.5 oz75 cm / 29.5 inNo
Patagonia Nano Air (Men's - Women's)41/5ReviewNoNoNoSyntheticN/AN/AN/AFullRange60 g33D Nylon ripstopAll RoundTrim318 g / 11.2 oz?No
Arc'teryx Atom (aka LT) (Men's - Women's)43/6ReviewYes, meshNoNoSyntheticN/AN/AN/ACoreloft Continuous60 g/m²20D TyonoAll RoundTrim375 g / 13.2 oz74 cm / 29.1 inNo
Arc'teryx Cerium Lw. (aka SL) (Men's - Women's)43/6ReviewNoNoYesDown8505849,300Coreloft 40 + 100 g/m²Arato 7All RoundTrim215 g / 7.6 oz69 cm / 27.2 in No
Arc'teryx Cerium Hybrid (Men's)44/7NoNoYesDown8504437,400Coreloft 40 + 100 g/m²Arato 15 + Fortius Air 50All RoundTrim260 g / 9.2 oz70 cm / 27.5 inNo
Arc'teryx Proton Hybrid (Men's - Women's)46/8ReviewNoNoNoSyntheticN/AN/AN/ACoreloft Compact40 g/m²Fortius Air 50All RoundTrim365 g / 12.9 oz76 cm / 30 inNo
Arc'teryx Proton Lw. (aka FL) (Men's - Women's)48/9ReviewNoNoNoSyntheticN/AN/AN/AOcta Loft94 g/m²Fortius Air 20ClimbingTrim343 g / 12.1 oz75 cm / 29.5 inNo
Arc'teryx Atom Lw. (aka SL) (Men's - Women's)52/11ReviewYes, meshNoNoSyntheticN/AN/AN/ACoreloft Compact40 g/m²20D TyonoAll RoundTrim270 g / 9.5 oz72 cm / 28.3 inNo
REI Stormhenge Hybrid (Men's - Women's)TestingYes, zipsNoNoDown850?N/AN/A40D + 80DAll RoundRegular900 g / 1 lb 15.75 oz80 cm / 31.5 inNo
Arc'teryx Coelle Parka (Women's)TestingNoYesNoParkaN/AN/AN/ACoreloft80 + 140 g/m²40D 2L Gore-TexAround TownRegular460 g / 1 lb 0.2 oz95 cm / 37.4 inNo
Sabre Insulated (Men's)TestingYes, zipsYesNoSyntheticN/AN/AN/AN/ACoreloft60 + 80 g/m²Fortius Air 50Regular535g / 1 lb 2.9 oz?No

Find the estimated average lowest temperature ratings you can wear each jacket above, assuming: 

  • you only have a shirt under and no shell over, 
  • you're walking, 
  • it's a bit windy and there's no precipitation. 

If you think you run warmer or colder than the average person, then shift these ratings accordingly. 

Also,

  • Always opt for the warmer option when in doubt. 
  • Ratings will best respond to men's physiology. As most women tend to run colder than men, for women, bumping each rating by 10 - 20 deg F (5 - 10 deg C) is recommended. 
  • Ratings are applicable to your torso and arms only. In colder weather (below, say, 20 deg F (-6 deg C)), it becomes much harder to keep your hands, feet and head warm rather than your torso and arms. 
    • This is why getting beanies, gloves and socks are game changers in this regard. 
  • Further reading: 
    • CLO values of synthetic insulators: https://outdoorcrunch.com/clo-values/
    • Guide to Arc'teryx Jackets: https://outdoorcrunch.com/best-arcteryx-jacket/
    • Guide to Patagonia Jackets: https://outdoorcrunch.com/best-patagonia-jackets/
  • Also see:
    • Arc'teryx Jacket Finder: https://arcteryx.com/us/en/shop/jacket-finder

As you see, there's a strong correlation between FP x FW and temperature ratings, but not more than, say, 80%. I explained why this happens here in this post of mine. 


I hope this post was helpful for you to learn more about the jacket(s) in your mind.


Feel free to ask me any questions or provide feedback and I'll be happy to respond in the comment section below.


Guide: Insulated & Shell Jackets

Start here:

  • Best Arc'teryx Jackets: My Top Picks
  • Best Patagonia Jackets: My Top Picks
  • Best Down Jackets: My Top Picks
  • Best Insulated Jackets: My Top Picks
  • Temperature Ratings of Best Insulated Jackets
  • CLO values: Explained, compared & plotted
  • Ultimate Size Guide to Arc'teryx
  • StormHood vs DropHood

Complete list:

  • All Arc'teryx Shell Jackets sorted by performance
  • All Arc'teryx Ski Jackets sorted by performance
  • All Patagonia Ski Jackets sorted by performance
  • All Patagonia Winter Jackets compared
  • All Patagonia Fleeces compared
  • All Patagonia Rain Jackets compared
  • All Patagonia Down Jackets compared

Synthetic Insulated Jackets

  • Arc'teryx Proton LT
  • Patagonia Nano Air
  • Arc'teryx Atom LT
  • Arc'teryx Atom AR
  • Patagonia Nano Puff
  • Patagonia Micro Puff
  • Arc'teryx Atom SL
  • Arc'teryx Proton FL
  • Arc'teryx Proton Hybrid Hoody
  • Arc'teryx Fission SV
  • Arc'teryx Dually Belay Parka
  • Arc'teryx Atom SL Anorak
  • Arc'teryx Kappa

Down Jackets

  • Arc'teryx Cerium LT
  • Arc'teryx Cerium SV
  • Arc'teryx Cerium SL
  • Arc'teryx Thorium AR
  • Patagonia Down Sweater
  • Arc'teryx Firebee AR
  • Arc'teryx Ceres SV

Parkas

  • Arc'teryx Thorsen
  • Arc'teryx Therme
  • Arc'teryx Camosun
  • Arc'teryx Patera
  • Arc'teryx Centrale
  • Patagonia Tres
  • Patagonia Vosque

Shell Jackets

  • Arc'teryx Beta SV
  • Arc'teryx Beta FL
  • Arc'teryx Beta AR
  • Arc'teryx Alpha AR
  • Arc'teryx Alpha SV
  • Arc'teryx Gamma MX
  • Arc'teryx Gamma LT
  • Arc'teryx Gamma SL

Ski Jackets

  • Arc'teryx Rush
  • Arc'teryx Rush IS
  • Arc'teryx Sabre LT
  • Arc'teryx Sabre AR
  • Arc'teryx Cassiar
  • Arc'teryx Sidewinder
  • Arc'teryx Macai

Fleece Jackets

  • Patagonia R1
  • Patagonia R2
  • Patagonia Synchilla
  • Patagonia Better Sweater

Wind Jackets

  • Arc'teryx Solano
  • Arc'teryx Nuclei FL
  • Patagonia Houdini
  • Patagonia Houdini Air
  • Arc'teryx Squamish
  • Arc'teryx Incendo
  • Arc'teryx Norvan SL
  • Arc'teryx Trino SL

Rain Jackets

  • Patagonia Torrentshell
  • Patagonia Torrentshell Insulated
  • Arc'teryx Beta SL Hybrid
  • Arc'teryx Zeta FL

Also see:

  • Arc'teryx vs Patagonia
  • List of Manufacturing Facilities of all Arc'teryx Jackets

Thank you for reading!

Filed Under: Insulated Jackets Tagged With: arcteryx, jackets, jackets temperature ratings

Reader Interactions

Comments

  1. Brandon says

    February 21, 2020 at 4:45 pm

    Where’s Fission SV fitting in this warmth chart?

    • Canberk Köksal says

      February 21, 2020 at 5:05 pm

      Hi Brandon, Fission SV is added to chart.

      Because my site is using a cache, you might not be able to see the updated chart when you refresh this page. In that case, try reloading the page through Shift + F5 keyboard shortcut.

      Hope this helps.

  2. Benoit says

    April 19, 2020 at 11:15 am

    Where would you put the macro puff hoody in the chart?

    • Canberk Koksal says

      April 19, 2020 at 3:34 pm

      Thank you for your comment Benoit! Macro Puff is just added into the chart.

  3. Stuart says

    August 31, 2020 at 5:03 pm

    Hi, I was just wondering if/when you may be able to include the new Patagonia DAS Light Hoody and the re-released Patagonia DAS Parka on the charts above..?

    Additionally, I noticed that you included the OR Refuge, but any chance that the Refuge Air will be included as well? Just curious.

    Thanks!

  4. Stuart says

    September 3, 2020 at 6:50 pm

    Hi, I was wondering if you would be able to rank/add Patagonia’s new DAS Light Hoody and re-released DAS Parka to the list…?

    Additionally, while you did include the OR Refuge, just out of curiosity, where would the OR Refuge Air sit on the list?

    Thanks!

  5. Kristine says

    November 22, 2020 at 6:38 pm

    Hi. I’m not seeing wool blend options in this lineup. How would something like Icebreaker’s Stratus (180g merinoloft) compare to down/synthetic as far as warmth?

  6. fernando says

    November 27, 2020 at 9:48 am

    Hi from spain, first of all thanks for your wonderful page.

    Do you know the Outdoor Research Ascendant?
    In what temperature range is it?
    Like the atom lt?
    Thank you!!

    • Canberk says

      November 27, 2020 at 12:12 pm

      Thank you for your comment and kind words Fernando.

      I was going to review the Ascendant, but then I couldn’t find the product page of its men’s version at outdoorresearch.com. Seems like the only available option now is women’s counterpart.

      Do you know what happened to the men’s version? I contacted the OR about this and now waiting for their response.

  7. Alexander says

    December 7, 2020 at 12:32 am

    There’s an error in your math in the example of Eos versus Transcendent. 141 x 700 is over 98000, much more than what you state, and more than Eos.

    Also, if you converted to ounces your calculations would have units of cubic inches rather than some odd cu. In. * Gram / Oz

    Otherwise looks like a good resource and looking forward to reading through all this.

    • Canberk says

      December 8, 2020 at 12:37 pm

      Thank you for your comment Alexander!

      That’s a great catch, thank you for paying attention to the post. The incorrect numbers of the calculation was actually the “141 x 700”, though. The correct values for the Transcendent are 116 x 650 (source: https://www.outdoorresearch.com/us/mens-transcendent-down-hoodie-268084#eyJvcl9zaXplIjoiNzIifQ__) as mentioned.

      The typo is now fixed, but the placements and results stay the same. You might not be able to see the edited version of the page right away. Because my site uses caching, and it might take a few days until it’s purged.

      I’ll check out your comments about the units and will make edits accordingly.

      Glad you found this post helpful.

      Thanks!

  8. Andrew says

    December 10, 2020 at 8:15 pm

    Rab has now changed their 750 down in the Microlight Alpine to a 700 totally recycled down. This is from their site:

    “Insulation: Recycled 700 fill-power down Nikwax hydrophobic (water-resistant) finish (153g Size L)”

    The old jacket was :

    “750FP R.D.S Certified European Goose Down (143g/5oz in Size L)”

    Thanks for this great information!

  9. zhaoyuan miao says

    December 17, 2020 at 6:47 pm

    Thank you for the depth review. Helps a lot. I hope there is a donation button to appreciate your hard work and researching

    • Canberk says

      December 23, 2020 at 11:59 am

      Glad it was helpful for you.

      Yes, you can this donation button: https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=EVA3S7ME6LZB6&currency_code=USD

      I’m flattered, appreciate it, thanks!

  10. Jc says

    December 27, 2020 at 5:23 pm

    I mean great article. This is how everything should be written. As much info as possible.
    I’d say the only thing missing is how down fill powder is created/made. I’m very curious how a duck feather can go from 600 to 850fp. Is it a different part of the feather or do they do something to the feather. I would love to see that added to this Article.

    • Canberk says

      December 28, 2020 at 12:55 pm

      Glad to hear it was helpful for you JC.

      They don’t do anything to the feather. It’s all natural. In most cases, the difference is mostly due to the genetics of ducks.

  11. Michael Kyle says

    January 6, 2021 at 6:27 am

    I Don, t see anything from the Canada goose line in any list, just wondering why?

    • Canberk says

      January 6, 2021 at 8:06 am

      Currently I’m on this. Gathering information, analyzing products, etc. They’ll be added soon.

  12. Jeff Wile says

    January 15, 2021 at 10:19 pm

    Simply Amazing !
    i’ve been hunting and pecking tryying to find this type of information for a purchase(s) and stumbled upon your site.
    you have spend a loooooot of time putting this together. the “sales” sites almost never have enough information upon which to make a good decision by making comparisons! it’s been quite frustrating to have to spend hours looking for data like this and the manufacturers aren’t really forthcoming with this data.
    Simply Amazing ! thank you so much for all of your work.
    i immediately copied it all off in case i don’t find this again.

  13. jeff Wile says

    January 15, 2021 at 10:30 pm

    i forgot to add that it’s time to replace all of my outside gear as it all is 50, or so, years old, and is totally disintegrating. prices have changed in that time ! –it makes me groan when i see the price tags, but it was well worth it, waaay back when, to do research in what i was buying and to obtain the best that i could. this really helps me thru the labryinth of finding what i want.
    these next purchases, i figure, will be my last as i’m 68 and probably won’t be around for another 50….but maybe my kids or grandkids can wear what i leave behind. when i got my first gear there were no stores to buy anything in. outside clothing and equipment was not anywhere to be found, at least for someone living in Northern Wisconsin. my first boots came from a garbage can ! they had holes in the bottoms but were warm and rugged ! thanks again.

  14. Ted says

    January 26, 2021 at 2:23 pm

    Amazing research! Thank you. As mentioned above, would be very curious to know where the new Patagonia DAS parka sits, also the Black Diamond Belay (Stance) Parka or whatever they keep renaming it to – definitely interested in the synthetics that push the low temp limits.

  15. Jon says

    March 3, 2021 at 7:31 pm

    Hi Fantastic information and research, thank you, can you add the Rab Valiance please?

    Thanks

    Jon

  16. John says

    May 24, 2021 at 9:46 am

    Awesome work! Reading this all the way in South Africa. We basically buy one brand nationwide. This helped quite a lot with figuring out what I need. You’re soo technical. It’s inspiring
    I’m in awe.

  17. Debra says

    June 23, 2021 at 11:33 pm

    What a great review, so much research..thank you. whilst this lists the minimum temperature the parkas are rated for what is the maximum temperature. Would a 650 rating be good for 5 – 15 degrees Celcius for example

  18. Sylvester says

    October 2, 2021 at 5:40 am

    Arc teryx has Agrium on their website now. Where would that sit in the chart?

  19. Matthew says

    October 11, 2021 at 1:49 pm

    Hi ! I am super cold natured and usually wear an insulated Carhartt hoodie and thermal jacket in 40 degrees weather. Usually a North Face Nuptse. Can you recommend a good jacket I can wear without having 3 to 4 layers under it. A lot of the times I wear an insulated Carhartt suits bibs and jacket over this. I do wear insulated underwear all winter.

    Thank you!

  20. nobody says

    October 11, 2021 at 6:38 pm

    Please add Eddie Bauer Peak XV. (Great value at once a year 60% off sale).

  21. GARTH MCMURTREY says

    October 31, 2021 at 1:28 am

    Great work! The trouble is that many of the selections you have listed are not available. Very disappointing because I get all excited then I can’t get one. I suppose it’s lots of work to keep up with the market and remove pieces that go out of production.
    thanks for your work!

  22. Fil says

    November 2, 2021 at 3:50 pm

    Very informative article, but you missed off one of the main factors that affect the warmth of a down jacket…construction!

    3 identical jackets, with the same face fabric, fill weight and fill power, will not be the same warmth depending on construction. If one is stitch-through, one box wall and one is over lapping baffles, then the warmth (and cost) will vary.

    This is why jackets like the Berghaus Ramche 2 down jacket (my favourite jacket I own) weighing 456 grams with only 183g of 850fp down is rated to minus 20 / minus 25 degrees C, as it has overlapping insulation meaning it is much warmer than heavier, higher fill weight jackets.

    Construction is one of the key things I look for as it is a better indicator of warmth than FW x FP alone.

    That aside, some very informative and detailed descriptions and analysis.

  23. Murali says

    November 24, 2021 at 8:49 am

    Hi,
    RESPECT for a detailed research and review. Stumbled upon this while researching for jackets.
    I have a question if I may, for synthetic jackets I see that the least temp for sameg/m2 isn’t the same for jackets with coreloft(arc tryx kappa) vs. those thermatek (arc tryx Dually). is this a case of one tech being better than other or is it a function of the overall jacket build?
    In corollary, can it be assumed that jackets with same g/m2 ratings would be equally warm irrespective of technology?

    • Canberk says

      November 24, 2021 at 10:48 am

      Hi Murali,

      Thank you.

      Good question. The difference is actually caused by a combination of both of the reasons you mentioned – tech differences and overall jacket build (mostly the nature of face fabrics).

  24. Sylvester says

    November 29, 2021 at 5:17 am

    Hi, thanks a lot for the comprehensive testing/analyses. Would you mind adding Mountain Hardwear or Mammut insulation jackets? They are also regarded as high quality products (especially the EigerExtreme line)

  25. Francesco says

    December 2, 2021 at 9:26 am

    Hello. Thank you so much for sharing this amount of information. I don’t see in this list some Scandinavian or other European outdoor clothing brands (except RAB). When possible, can you review some of these? I don’t have any versus American brands. I had a Tommy Hilfinger and PME Legend jacket (both stolen in a discotheque), and I’m planning to buy a new jacket: I like Patagonia, Marmut, Columbia (who has acquired Mountain Hardware), The North Face and others; but some Nordic brands are great, too. For example, Fjallraven makes his own products instead of using Gore-tex etc. Sorry for my English, I’m Italian.

    • Canberk says

      December 9, 2021 at 10:23 am

      Thanks Francesco. I’ll take your comments into consideration and see what I can do. Great to hear you found my site helpful.

  26. james xie says

    December 3, 2021 at 5:06 am

    medium sized cerium lt has 102g 850 power fill down with Arato 10 face fabric. kole has 72g 750 power fill with 20D nylon. why temperature chart of cerium is -2* and kole is -12*? and how about agrium which has 117g 850 power fill down with Arato 15 fabric? thank you.

    • Canberk says

      December 3, 2021 at 10:12 am

      Hi James,

      As I explained earlier into the article, this difference is caused by additional synthetic insulator use.

      Best,
      C

  27. Jim Meek says

    December 11, 2021 at 8:00 pm

    Thanks for this great information. As a hiker who lives in the southeastern US (and not in, say, Jackson Hole), I struggle to know how to make adjustments from reviews often written for more aerobic activities in colder climates. Note: Almost exactly half the US population lives south of about 37° latitude, roughly the line from the North Carolina-Virginia border, across northern Oklahoma, to central California (about Fresno). While some of us head to New England or Colorado for winter skiing, lots of others are just trying to figure out how to stay comfortably warm while active in the outdoors nearer home.) The information on your site helps.

    I noticed that your temperature ratings no longer include the Outdoor Research Refuge or Transcendent (and perhaps others). I assume this is because OR is no longer making these two jackets. I’d like to encourage you to keep orphan items in your list for a bit longer. Outdoor gear sites are still selling these jackets new, and lots of us with limited means look for good used gear online, so it would be helpful to keep archived data In your rankings for a few years (or start a third table for discontinued items?). Thanks.

  28. STEFANO says

    April 11, 2022 at 12:55 am

    About down insulation you’d to consider other elements and in particolar the ratio between down and feathers and the baffle construction.
    Higher percentage of down mean more warmth. The right calculation should be fill power x fill weight x ratio between down and feathers. For example, Feathered Friends Rock and Ice parka, in size medium, has 20,5 oz, fill down 900, ratio 0,96 (96% down 4% feathers), Rab expedition 8000 m jacket has, in size medium, 19 oz of down 850, with a ratio of 0,90.
    Another important element is the baffle construction: a box baffle jacket is far warmer than a serena through jacket with the same fill power and fill weight. The construction is important also for synthetic cloths because stitch through cause cold spot.
    The least but not the last, the material of the outer layer and the type of insulation. Some are waterproof and windproof, others are water resistant and windproof, others water and wind resistant, others more breathable and only slightly wind resistant, like the patagonia nano air or the arc’teryx atom. Matetials like fullrange and polartec alpha are very permeable to wind

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