Summary
Name Est. Temp (F/C) Review Pit venting? Stuffs into itself? Two way zipper? Type Fill Power Fill Weight (grams) Fill Volume (FP x FW) Synthetic Insulator (SI) SI Amount Face Fabric Activity Fit Weight Length (CB) Size Chart Arc'teryx Alpha (Men's - Women's) -18/-28 Review No Yes Yes Down 850 296 251,600 Coreloft 90 g/m² N30r 2L GoreTex Infinium Climbing Regular 805 g / 1 lb 12.4 oz 86 cm / 34 in [Women's] Feathered Friends Khumbu -17/-27 No Yes No Down 900 378 340,200 Primaloft Gold 200 g Pretex Shield XT All Round Regular 960 g / 2 lb 2 oz ? Arc'teryx Ceres SV (Men's - Women's) -15/-26 Review No Yes Yes Down 850 240 204,000 Coreloft ? Arato 30 All Round Regular 880 g / 1 lb 15 oz 86 cm / 34 in [Men's / Women's] Mountain Equipment K7 (Men's) -13/-25 No Yes Yes Down 800 300 240,000 N/A N/A 30D Drilite All Round Regular 820 g / 1 lb 13 oz 76 cm / 30 in Rab Positron Pro (Men's) -13/-25 No Yes Yes Down 800 300 240,000 N/A N/A 40D Pertex Quantum Pro All Round Regular 740 g / 1 lb 10 oz 85 cm / 33.5 in [Men's] Arc'teryx Therme SV (Men's) -11/-24 Review No No Yes Parka 750 211 158,250 Coreloft 60 g/m² 2L Gore-Tex Around Town Regular 1.072 kg / 2 lb 5.8 oz 96 cm / 37.75 in Patagonia Grade VII (Men's) -11/-24 No No Yes Down 800 335 268,000 N/A N/A 1.2 oz 15 & 20D Perfex Quantum Around Town Regular 743 g / 1 lb 10.1 oz 83 cm / 32.5 in Arc'teryx Firebee AR (Men's - Women's) -10/-23 Review No Yes Yes Down 800 225 180,000 N/A N/A Arato 7 & 10 All Round Regular 680 g / 1 lb 8 oz 79 cm / 31 in [Men's / Women's] Mountain Equipment Exo (Men's) -10/-23 No Yes Yes Down 800 265 212,000 N/A N/A Nylon All Round Regular 770 g / 1 lb 11.2 oz 79 cm / 31 in Arc'teryx Thorsen (Men's) -7/-22 Review No No Yes Parka 750 192 144,000 Coreloft 60 g/m² 90D 2L Gore-Tex Around Town Regular 1.1 kg / 2 lb 5.4 oz 91 cm / 36 in [Men's] Patagonia Frozen Range (Men's - Women's) -6/-21 Review No No No Parka 700 268 187,600 N/A N/A 4 oz 75-denier polyester Around Town Regular 1.253 kg / 2 lb 12.2 oz 84 cm / 33 in [Men's / Women's] Mountain Equipment Li. Ec. (Men's - Women's) -5/-20 No No Yes Down 700 295 206,500 N/A N/A 50D Drilite All Round Regular 822 g / 1 lb 13 oz 72 cm / 28 in Arc'teryx Patera Long (Women's) -2/-19 No No Yes Parka 750 74 55,500 Coreloft 60 + 80 g/m² 2L Gore-Tex Around Town Regular 1.1 kg / 2 lb 6.8 oz 117.5 cm / 46.25 in Rab Neutrino Pro (Men's - Women's) -2/-19 No Yes Yes Down 800 212 169,600 N/A N/A 20D Pertex Quantum Pro All Round Regular 585 g / 1 lb 8.6 oz 77 cm / 30.3 in [Men's / Women's] Arc'teryx Dually Belay (Men's) 0/-18 Review No Yes Yes Synthetic N/A N/A N/A ThermaTek 92 g/m² 30D Nylon Around Town Regular 705 g / 1 lb 9 oz 84 cm / 33 in [Men's] Arc'teryx Centrale (Women's) 0/-18 Review No No Yes Parka 750 157 117,750 Coreloft 60 g/m² N90p Nylon Around Town Regular 885 g / 1 lb 15.2 oz 95 cm / 37.5 in [Women's] Arc'teryx Camosun (Men's) 0/-18 Review No No No Parka 750 105 78,750 Coreloft 140 g/m² N150p-X Gore-Tex Around Town Trim 960 g / 2 lb 1.9 oz 80 cm / 31.5 in [Men's] Arc'teryx Cerium SV (Men's) 0/-18 Review No Yes No Down 850 162 137,700 Coreloft 80 + 140 g/m² Arato 7 & 10 All Round Regular 415 g / 14.6 oz 69.5 cm / 27.4 in [Men's / Women's] Arc'teryx Revet (Men's) 2/-17 No No Yes Parka 750 ? N/A N/A 20d nylon/spandex double weave Around Town Regular 755 g / 1 lb 10.6 oz 91 cm / 36 in Arc'teryx Piedmont (Men's) 3/-16 No Yes Yes Parka 750 218 163,500 N/A N/A Arato 10 Around Town Regular 515 g / 1 lb 2.2 oz 82 cm / 32.25 in Arc'teryx Fission SV (Men's - Women's) 3/-16 Review No No Yes Synthetic N/A N/A N/A Coreloft Continuous 90 + 65 g/m² N80p-X Gore-Tex 2L All Round Regular 890 g / 1 lb 15.4 oz 81 cm / 31.8 in [Men's / Women's] Arc'teryx Alpha Lightweight (Men's) 3/-16 No Yes Yes Down 850 117 99,450 Coreloft Compact 40 g/m² Hadron 2L Gore-Tex Infinium Climbing Regular 540 g / 1 lb 3 oz ? Outdoor Research Sup. Alp. (Men's - Women's) 3/-16 No No Yes Down 800 182 145,600 N/A N/A 30D Pertex Quantum Pro All Round Regular 825 g / 1 lb 13.1 oz 85 cm / 33.5 in [Men's / Women's] Arc'teryx Alessa Long (Women's) 3/-16 No No No Parka N/A N/A N/A Coreloft 80 + 120 g/m² N90p 2L Gore-Tex Around Town Regular 1.015 kg / 2 lb 3.8 oz 123 cm / 48.5 in Patagonia Tres 3-in-1 (Men's - Women's) 3/-16 Review No No No Parka 700 118 82,600 N/A N/A 5.5 oz polyester Around Town Regular 1.307 kg / 2 lb 14.1 oz 85 cm / 33.5 in [Men's / Women's] Arc'teryx Radsten Parka (Men's) 3/-16 No No No Parka N/A N/A N/A Coreloft Compact 120 g/m² NP100d Gore-Tex 2L Around Town Regular 745 g / 1 lb 10.3 oz 82 cm / 32.25 in Rab Electron Pro (Men's - Women's) 5/-15 No Yes Yes Down 800 180 144,000 N/A N/A 20D Pertex Quantum Pro All Round Regular 525 g / 1 lb 2.5 oz 74 cm / 29 in [Men's / Women's] Arc'teryx Therme Parka (Men's) 5/-15 Review No No Yes Parka 750 120 90,000 Coreloft 60 + 80 g/m² P75d Polyester Around Town Regular 991 g / 2 lb 3 oz 85 cm / 33.5 in [Men's] Arc'teryx Macai (Men's) 5/-15 Review Yes, zips No No Down 750 69 51,750 Coreloft Compact 60 + 100 g/m² N40p-X 3L Gore-Tex Ski/Snowboard Regular 1 kg / 2 lb 4 oz 76 cm / 30 in [Men's] Arc'teryx Nuclei SV (Men's) 5/-15 Review No Yes Yes Synthetic N/A N/A N/A Coreloft Continuous 180 g/m2 + 90 g/m2 Arato 15 Climbing Regular 600 g / 1 lb 5.2 oz 81 cm / 31.8 in [Men's / Women's] Patagonia DAS Parka (Men's) 5/-15 No Yes Yes Parka N/A N/A N/A PrimaLoft Gold Insulation Eco 133 + 40 g Pertex Quantum Pro Around Town Regular 555 g / 1lb 3.6 oz 84 cm / 33 in [Men's / Women's] Arc'teryx Patera (Women's) 5/-15 Review No No Yes Parka 750 58 43,500 Coreloft 60 + 80 g/m² 2L Gore-Tex Around Town Trim 867 g / 1 lb 14.6 oz 93 cm / 37 in [Women's] Black Diamond Access Down (Men's - Women's) 7/-14 No Yes Yes Down 700 155 108,500 N/A N/A 30D ripstop nylon All Round Regular 442 g / 15.6 oz 76 cm / 29.75 in [Men's / Women's] Arc'teryx Kappa (Men's) 7/-14 Review No No Yes Synthetic N/A N/A N/A Coreloft Continuous 140 g/m² N70p Gore Thermium All Round Regular 755 g / 1 lb 10.6 oz 80 cm / 31.5 in [Men's] Arc'teryx Prema Down Coat (Women's) 7/-14 No No Yes Parka 750 92 69,000 N/A N/A Nylon Around Town Regular 794 g / 1 lb 12 oz 117 cm / 46.1 in [Women's] Arc'teryx Radsten Insulated (Men's) 7/-14 No No No Parka N/A N/A N/A Coreloft Compact 120 g/m² NP100d Gore-Tex 2L Around Town Regular 715 g / 1 lb 9.2 oz 73 cm / 28.75 in Rab Microlight Alpine (Men's - Women's) 7/-14 No Yes No Down 700 153 107,100 N/A N/A 30D Pertex Quantum All Round Regular 466 g / 1 lb 0.5 oz 72 cm / 28.5 in [Men's / Women's] Arc'teryx Thorium (Men's - Women's) 7/-14 Review No Yes Yes Down 750 140 105,000 Coreloft 80 + 140 g/m² Arato 30 All Round Regular 517 g / 1 lb 2.2 oz 71.5 cm / 28.1 in [Men's] Feathered Friends Eos 8/-13 No Yes No Down 900 105 94,500 N/A N/A Pertex Quantum All Round Regular 306 g / 10.8 oz ? Arc'teryx Thorium AR (Men's - Women's) 8/-13 Review No Yes No Down 750 130 97,500 Coreloft 80 + 140 g/m² Arato 30 All Round Regular 490 g / 1 lb 1.3 oz 72 cm / 28.3 in [Men's / Women's] Patagonia Macro Puff (Men's - Women's) 8/-13 Review No No No Synthetic N/A N/A N/A PlumaFill 135 + 90 g 10D Recycled nylon ripstop All Round Regular 435 g / 15.3 oz 79 cm / 31 in [Men's / Women's] Arc'teryx Macai LT (Men's) 8/-13 Yes, zips No No Down 750 49 36,750 Coreloft Compact 60 g/m² N40p-X 3L Gore-Tex Ski/Snowboard Regular 855 g / 1 lb 14.2 oz 74 cm / 29.1 in Arc'teryx Seyla (Women's) 8/-13 No No Yes Parka 750 92 69,000 N/A N/A Arato 10 Around Town Regular 507 g / 1 lb. 1.9 oz. 87 cm / 34.4 in [Women's] Patagonia Fitz Roy (Men's - Women's) 8/-13 No Yes No Down 800 128 102,400 N/A N/A 20D Nylon All Round Regular 632 g / 1lb 6.3 oz 74 cm / 29 in [Men's / Women's] Arc'teryx Koda (Men's) 8/-13 No No No Parka N/A N/A N/A Coreloft 80 + 140 g/m² N80p-X Gore-Tex Around Town Regular 720 g / 1 lb 9.4 oz 75 cm / 29.5 in [Men's] Patagonia Vosque 3-in-1 (Women's) 10/-12 Review No No No Parka N/A N/A N/A ThermoLite 100 g 65% nylon, 35% polyester Around Town Regular 1.360 kg / 3 lb 90 cm / 35.5 in [Women's] Patagonia City Storm Down (Men's - Women's) 12/-11 No Yes No Parka 700 191 133,700 N/A N/A 4.2 oz polyester All Round Regular 468 g / 16.5 oz 91 cm / 36 in Patagonia Jackson Glacier (Men's - Women's) 12/-11 Review No No Yes Parka 700 141 98,700 N/A N/A 3.6 oz 50D polyester Around Town Regular 880 g / 1 lb 15 oz 79 cm / 31 in [Men's / Women's] Arc'teryx Sensa (Women's) 14/-10 No No Yes Parka N/A N/A N/A Coreloft Compact 120 g/m² NP100d Gore-Tex 2L Around Town Relaxed 785 g / 1 lb 11.7 oz 86 cm / 34 in Patagonia Hi Loft Down (Men's - Women's) 14/-10 Review No Yes No Down 600 177 106,200 N/A N/A 1.4 oz 30D polyester All Round Regular 540 g / 1 lb 3 oz 76 cm / 30 in [Men's] REI Magma 850 Hoodie 2.0 (Men's - Women's) 14/-10 No Yes No Down 850 120 102,000 N/A N/A Pertex mini ripstop nylon All Round Regular 340 g / 13.75 oz 74 cm / 29.25 in [Men's / Women's] Arc'teryx Beta Insulated Coat (Women's) 16/-9 Review No No Yes Synthetic N/A N/A N/A Coreloft 80 g/m² + 120 g/m² 2L 40D Gore-Tex Around Town Regular 600 g / 1 lb 5.2 oz ? Arc'teryx Atom AR (Men's - Women's) 18/-8 Review Yes, mesh No No Synthetic N/A N/A N/A Coreloft Continuous 120 g/m2 + 80 g/m2 + 60 g/m2 30D Tyono All Round Regular 475 g / 1 lb 74 cm / 29.1 in [Men's / Women's] Patagonia Downdrift (Men's - Women's) 18/-8 No No No Down 600 279 167,400 N/A N/A 4.2 oz polyester Around Town Regular 1.014 kg / 2 lb 3.8 oz ? [Men's / Women's] Arc'teryx Magnus (Men's) 19/-7 No No No Parka N/A N/A N/A Coreloft 80 g N60p Gore-Tex 2L Around Town Regular 690 g / 1 lb 8.3 oz 83 cm / 32.5 in [Men's] Arc'teryx Agrium (Men's - Women's) 21/-6 No Yes No Down 850 117 99,450 N/A N/A Arato All Round Regular 365 g / 12.9 oz 75 cm / 29.5 in Patagonia AlpLight Down (Men's - Women's) 21/-6 No Yes No Down 800 100 80,000 N/A N/A 0.8 oz 10D polyester All Round Slim 270 g / 9.5 oz 74 cm / 29 in [Men's] Arc'teryx Beta Insulated (Men's - Women's) 21/-6 Review Yes, zips No Yes Synthetic N/A N/A N/A Coreloft Continuous 80 g/m² 2L 40D Gore-Tex All Round Regular 680 g / 1 lb 8 oz 78.5 cm / 31 in Patagonia Topley (Men's) 23/-5 No No Yes Down 700 172 120,400 N/A N/A 6 oz polyester All Round Regular 1.133 kg / 2 lb 8 oz 77 cm / 30.5 in [Men's] Arc'teryx Alpha IS (Men's) 23/-5 No Yes Yes Synthetic N/A N/A N/A Coreloft Continuous 65 g/m² N40p-X 2L Gore-Tex Climbing Regular 610 g / 1 lb 5.5 oz 78 cm / 30.75 in [Men's] Rab Xenon 2.0 (Men's - Women's) 23/-5 No Yes Yes Synthetic N/A N/A N/A PrimaLoft Silver 60 g 30D Pertex Quantum All Round Regular 385 g / 13.6 oz 71.5 cm / 28.1 in [Men's / Women's] Patagonia Down Sweater (Men's - Women's) 23/-5 Review No Yes No Down 800 150 120,000 N/A N/A 1.4 oz 20x30D polyester All Round Regular 428 g / 15.1 oz 67 cm / 26.25 in [Men's / Women's] Arc'teryx Ralle Parka (Men's) 25/-4 No No Yes Parka N/A N/A N/A Coreloft 80 g/m² 2L 40D Gore-Tex Around Town Regular 735 g / 1 lb 9.9 oz ? Patagonia Silent Down (Men's - Women's) 26/-3 Review No No No Down 700 109 76,300 N/A N/A 2.2 oz polyester Around Town Regular 585 g / 1 lb 4.7 oz 74 cm / 29 in [Men's / Women's] Arc'teryx Therme Insulated (Men's) 26/-3 Review No No No Synthetic N/A N/A N/A Coreloft Compact 40 g/m² 2L Gore-Tex Around Town Regular 960 g / 2 lb 1.9 oz 73 cm / 28.75 in Arc'teryx Cerium (Men's - Women's) 26/-3 No Yes No Down 850 113 96,050 Coreloft 80 + 100 g/m² Arato 15 All Round Trim 335 g / 11.8 oz ? Mountain Hardwear GW/2 (Men's - Women's) 28/-2 No Yes No Down 800 85 68,000 N/A N/A 10D Ripstop Nylon All Round Trim 250 g / 8.8 oz 70 cm / 27.5 in [Men's / Women's] Arc'teryx Cerium LT (Men's - Women's) 28/-2 Review No Yes No Down 850 102 86,700 Coreloft 80 + 100 g/m² Arato 10 All Round Trim 305 g / 10.8 oz 72 cm / 28.3 in [Men's / Women's] Arc'teryx Nuclei FL (Men's - Women's) 32/0 Review No Yes No Synthetic N/A N/A N/A Coreloft Continuous 65 g/m² Arato 10r Climbing Trim 325 g / 11.5 oz 75 cm / 29.5 in [Men's / Women's] Patagonia DAS Light (Men's - Women's) 34/1 No Yes Yes Synthetic N/A N/A N/A PlumaFill 65 g 0.8-oz 10-denier Pertex Quantum Pro Climbing Regular 320 g / 11.3 oz 77 cm / 30.5 in Patagonia Micro Puff (Men's - Women's) 36/2 Review No Yes No Synthetic N/A N/A N/A PlumaFill 65 g Pertex Quantum All Round Trim 298 g / 10.5 oz 75 cm / 29.5 in [Men's / Women's] Patagonia Isthmus (Men's) 36/2 No No No Parka N/A N/A N/A ThermoGreen 60 g 4.2 oz polyester Around Town Regular 895 g / 1 lb 15.6 oz 70 cm / 27.5 in [Men's] Arc'teryx Proton LT (Men's - Women's) 37/3 Review No No No Synthetic N/A N/A N/A Coreloft Compact 80 g/m2 + 60 g/m2 Fortius Air 20 Climbing Trim 375 g / 13.2 oz 75 cm / 29.4 in [Men's / Women's] Patagonia Nano Puff (Men's - Women's) 37/3 Review No Yes No Synthetic N/A N/A N/A PrimaLoft Gold Insulation Eco 60 g 22D Polyester All Round Regular 363 g / 12.8 oz 71.5 cm / 28 in [Men's / Women's] Arc'teryx Norvan SL Ins. (Men's - Women's) 39/4 No Yes No Synthetic N/A N/A N/A Coreloft Compact 40 g/m² Gore-Tex ShakeDry Running Trim 270 g / 9.5 oz 71.5 cm / 28.1 in [Men's / Women's] Patagonia Nano Air (Men's - Women's) 41/5 Review No No No Synthetic N/A N/A N/A FullRange 60 g 33D Nylon ripstop All Round Trim 318 g / 11.2 oz ? [Men's / Women's] Arc'teryx Atom LT (Men's - Women's) 43/6 Review Yes, mesh No No Synthetic N/A N/A N/A Coreloft Continuous 60 g/m² 20D Tyono All Round Trim 375 g / 13.2 oz 74 cm / 29.1 in [Men's / Women's] Arc'teryx Cerium SL (Men's - Women's) 43/6 Review No Yes No Down 850 58 49,300 Coreloft 40 + 100 g/m² Arato 7 All Round Trim 215 g / 7.6 oz 69 cm / 27.2 in [Men's / Women's] Arc'teryx Proton Hybrid (Men's - Women's) 46/8 Review No No No Synthetic N/A N/A N/A Coreloft Compact 40 g/m² Fortius™ Air 50 All Round Trim 365 g / 12.9 oz ? [Women's] Arc'teryx Proton FL (Men's) 48/9 Review No No No Synthetic N/A N/A N/A Octa Loft 94 g/m² Fortius Air 20 Climbing Trim 323 g / 11.4 oz 77 cm / 30.4 in [Men's / Women's] Arc'teryx Atom SL (Men's - Women's) 52/11 Review Yes, mesh No No Synthetic N/A N/A N/A Coreloft Compact 40 g/m² 20D Tyono All Round Trim 245 g / 8.6 oz 72 cm / 28.3 in [Men's / Women's] REI Stormhenge Hybrid (Men's - Women's) Testing Yes, zips No No Down 850 ? N/A N/A 40D + 80D All Round Regular 900 g / 1 lb 15.75 oz 80 cm / 31.5 in [Men's / Women's] Arc'teryx Monitor Insulated (Women's) Testing No No Yes Parka N/A N/A N/A Coreloft 80 + 100 g/m² 40D 3L Gore-Tex Around Town Oversized 645 g / 1 lb 6.8 oz 93 cm / 37 in Arc'teryx Coelle (Women's) Testing No No Yes Parka N/A N/A N/A Coreloft 80 + 140 g/m² 40D 2L Gore-Tex Around Town Regular 460 g / 1 lb 0.2 oz 93 cm / 37 in
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.
- 13 Mar 2023: I've been to Pfander and floodplain forests with my Nuclei SV
- 13 Dec 2022: Arc'teryx Alpha Parka Review: The most impressive jacket of all time
- 8 Dec 2022: Arc'teryx ReGEAR: OutdoorCrunch exclusive promo code!
- 7 Nov 2022: 2023 Thorium Hoody is in - as well as the new Thorium Parka (yes, parka)
- 2 Nov 2022: Beta Insulated Jacket: Pit zips AND two way zipper!
- 7 October 2022: Proton Hybrid Hoody is live! The ultimate do it all?
- 5 October 2022: DropHood vs StormHood: Pros/cons and best uses
- 5 September 2022: Reviewing Arc'teryx Fall Winter 22/23 Gear
- 5 August 2022: 5 things all Arc'teryx newbies should know
- #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.
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.
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).
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.
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.
Name Est. Temp (F/C) Review Pit venting? Stuffs into itself? Two way zipper? Type Fill Power Fill Weight (grams) Fill Volume (FP x FW) Synthetic Insulator (SI) SI Amount Face Fabric Activity Fit Weight Length (CB) Size Chart Arc'teryx Alpha (Men's - Women's) -18/-28 Review No Yes Yes Down 850 296 251,600 Coreloft 90 g/m² N30r 2L GoreTex Infinium Climbing Regular 805 g / 1 lb 12.4 oz 86 cm / 34 in [Women's] Feathered Friends Khumbu -17/-27 No Yes No Down 900 378 340,200 Primaloft Gold 200 g Pretex Shield XT All Round Regular 960 g / 2 lb 2 oz ? Arc'teryx Ceres SV (Men's - Women's) -15/-26 Review No Yes Yes Down 850 240 204,000 Coreloft ? Arato 30 All Round Regular 880 g / 1 lb 15 oz 86 cm / 34 in [Men's / Women's] Mountain Equipment K7 (Men's) -13/-25 No Yes Yes Down 800 300 240,000 N/A N/A 30D Drilite All Round Regular 820 g / 1 lb 13 oz 76 cm / 30 in Rab Positron Pro (Men's) -13/-25 No Yes Yes Down 800 300 240,000 N/A N/A 40D Pertex Quantum Pro All Round Regular 740 g / 1 lb 10 oz 85 cm / 33.5 in [Men's] Arc'teryx Therme SV (Men's) -11/-24 Review No No Yes Parka 750 211 158,250 Coreloft 60 g/m² 2L Gore-Tex Around Town Regular 1.072 kg / 2 lb 5.8 oz 96 cm / 37.75 in Patagonia Grade VII (Men's) -11/-24 No No Yes Down 800 335 268,000 N/A N/A 1.2 oz 15 & 20D Perfex Quantum Around Town Regular 743 g / 1 lb 10.1 oz 83 cm / 32.5 in Arc'teryx Firebee AR (Men's - Women's) -10/-23 Review No Yes Yes Down 800 225 180,000 N/A N/A Arato 7 & 10 All Round Regular 680 g / 1 lb 8 oz 79 cm / 31 in [Men's / Women's] Mountain Equipment Exo (Men's) -10/-23 No Yes Yes Down 800 265 212,000 N/A N/A Nylon All Round Regular 770 g / 1 lb 11.2 oz 79 cm / 31 in Arc'teryx Thorsen (Men's) -7/-22 Review No No Yes Parka 750 192 144,000 Coreloft 60 g/m² 90D 2L Gore-Tex Around Town Regular 1.1 kg / 2 lb 5.4 oz 91 cm / 36 in [Men's] Patagonia Frozen Range (Men's - Women's) -6/-21 Review No No No Parka 700 268 187,600 N/A N/A 4 oz 75-denier polyester Around Town Regular 1.253 kg / 2 lb 12.2 oz 84 cm / 33 in [Men's / Women's] Mountain Equipment Li. Ec. (Men's - Women's) -5/-20 No No Yes Down 700 295 206,500 N/A N/A 50D Drilite All Round Regular 822 g / 1 lb 13 oz 72 cm / 28 in Arc'teryx Patera Long (Women's) -2/-19 No No Yes Parka 750 74 55,500 Coreloft 60 + 80 g/m² 2L Gore-Tex Around Town Regular 1.1 kg / 2 lb 6.8 oz 117.5 cm / 46.25 in Rab Neutrino Pro (Men's - Women's) -2/-19 No Yes Yes Down 800 212 169,600 N/A N/A 20D Pertex Quantum Pro All Round Regular 585 g / 1 lb 8.6 oz 77 cm / 30.3 in [Men's / Women's] Arc'teryx Dually Belay (Men's) 0/-18 Review No Yes Yes Synthetic N/A N/A N/A ThermaTek 92 g/m² 30D Nylon Around Town Regular 705 g / 1 lb 9 oz 84 cm / 33 in [Men's] Arc'teryx Centrale (Women's) 0/-18 Review No No Yes Parka 750 157 117,750 Coreloft 60 g/m² N90p Nylon Around Town Regular 885 g / 1 lb 15.2 oz 95 cm / 37.5 in [Women's] Arc'teryx Camosun (Men's) 0/-18 Review No No No Parka 750 105 78,750 Coreloft 140 g/m² N150p-X Gore-Tex Around Town Trim 960 g / 2 lb 1.9 oz 80 cm / 31.5 in [Men's] Arc'teryx Cerium SV (Men's) 0/-18 Review No Yes No Down 850 162 137,700 Coreloft 80 + 140 g/m² Arato 7 & 10 All Round Regular 415 g / 14.6 oz 69.5 cm / 27.4 in [Men's / Women's] Arc'teryx Revet (Men's) 2/-17 No No Yes Parka 750 ? N/A N/A 20d nylon/spandex double weave Around Town Regular 755 g / 1 lb 10.6 oz 91 cm / 36 in Arc'teryx Piedmont (Men's) 3/-16 No Yes Yes Parka 750 218 163,500 N/A N/A Arato 10 Around Town Regular 515 g / 1 lb 2.2 oz 82 cm / 32.25 in Arc'teryx Fission SV (Men's - Women's) 3/-16 Review No No Yes Synthetic N/A N/A N/A Coreloft Continuous 90 + 65 g/m² N80p-X Gore-Tex 2L All Round Regular 890 g / 1 lb 15.4 oz 81 cm / 31.8 in [Men's / Women's] Arc'teryx Alpha Lightweight (Men's) 3/-16 No Yes Yes Down 850 117 99,450 Coreloft Compact 40 g/m² Hadron 2L Gore-Tex Infinium Climbing Regular 540 g / 1 lb 3 oz ? Outdoor Research Sup. Alp. (Men's - Women's) 3/-16 No No Yes Down 800 182 145,600 N/A N/A 30D Pertex Quantum Pro All Round Regular 825 g / 1 lb 13.1 oz 85 cm / 33.5 in [Men's / Women's] Arc'teryx Alessa Long (Women's) 3/-16 No No No Parka N/A N/A N/A Coreloft 80 + 120 g/m² N90p 2L Gore-Tex Around Town Regular 1.015 kg / 2 lb 3.8 oz 123 cm / 48.5 in Patagonia Tres 3-in-1 (Men's - Women's) 3/-16 Review No No No Parka 700 118 82,600 N/A N/A 5.5 oz polyester Around Town Regular 1.307 kg / 2 lb 14.1 oz 85 cm / 33.5 in [Men's / Women's] Arc'teryx Radsten Parka (Men's) 3/-16 No No No Parka N/A N/A N/A Coreloft Compact 120 g/m² NP100d Gore-Tex 2L Around Town Regular 745 g / 1 lb 10.3 oz 82 cm / 32.25 in Rab Electron Pro (Men's - Women's) 5/-15 No Yes Yes Down 800 180 144,000 N/A N/A 20D Pertex Quantum Pro All Round Regular 525 g / 1 lb 2.5 oz 74 cm / 29 in [Men's / Women's] Arc'teryx Therme Parka (Men's) 5/-15 Review No No Yes Parka 750 120 90,000 Coreloft 60 + 80 g/m² P75d Polyester Around Town Regular 991 g / 2 lb 3 oz 85 cm / 33.5 in [Men's] Arc'teryx Macai (Men's) 5/-15 Review Yes, zips No No Down 750 69 51,750 Coreloft Compact 60 + 100 g/m² N40p-X 3L Gore-Tex Ski/Snowboard Regular 1 kg / 2 lb 4 oz 76 cm / 30 in [Men's] Arc'teryx Nuclei SV (Men's) 5/-15 Review No Yes Yes Synthetic N/A N/A N/A Coreloft Continuous 180 g/m2 + 90 g/m2 Arato 15 Climbing Regular 600 g / 1 lb 5.2 oz 81 cm / 31.8 in [Men's / Women's] Patagonia DAS Parka (Men's) 5/-15 No Yes Yes Parka N/A N/A N/A PrimaLoft Gold Insulation Eco 133 + 40 g Pertex Quantum Pro Around Town Regular 555 g / 1lb 3.6 oz 84 cm / 33 in [Men's / Women's] Arc'teryx Patera (Women's) 5/-15 Review No No Yes Parka 750 58 43,500 Coreloft 60 + 80 g/m² 2L Gore-Tex Around Town Trim 867 g / 1 lb 14.6 oz 93 cm / 37 in [Women's] Black Diamond Access Down (Men's - Women's) 7/-14 No Yes Yes Down 700 155 108,500 N/A N/A 30D ripstop nylon All Round Regular 442 g / 15.6 oz 76 cm / 29.75 in [Men's / Women's] Arc'teryx Kappa (Men's) 7/-14 Review No No Yes Synthetic N/A N/A N/A Coreloft Continuous 140 g/m² N70p Gore Thermium All Round Regular 755 g / 1 lb 10.6 oz 80 cm / 31.5 in [Men's] Arc'teryx Prema Down Coat (Women's) 7/-14 No No Yes Parka 750 92 69,000 N/A N/A Nylon Around Town Regular 794 g / 1 lb 12 oz 117 cm / 46.1 in [Women's] Arc'teryx Radsten Insulated (Men's) 7/-14 No No No Parka N/A N/A N/A Coreloft Compact 120 g/m² NP100d Gore-Tex 2L Around Town Regular 715 g / 1 lb 9.2 oz 73 cm / 28.75 in Rab Microlight Alpine (Men's - Women's) 7/-14 No Yes No Down 700 153 107,100 N/A N/A 30D Pertex Quantum All Round Regular 466 g / 1 lb 0.5 oz 72 cm / 28.5 in [Men's / Women's] Arc'teryx Thorium (Men's - Women's) 7/-14 Review No Yes Yes Down 750 140 105,000 Coreloft 80 + 140 g/m² Arato 30 All Round Regular 517 g / 1 lb 2.2 oz 71.5 cm / 28.1 in [Men's] Feathered Friends Eos 8/-13 No Yes No Down 900 105 94,500 N/A N/A Pertex Quantum All Round Regular 306 g / 10.8 oz ? Arc'teryx Thorium AR (Men's - Women's) 8/-13 Review No Yes No Down 750 130 97,500 Coreloft 80 + 140 g/m² Arato 30 All Round Regular 490 g / 1 lb 1.3 oz 72 cm / 28.3 in [Men's / Women's] Patagonia Macro Puff (Men's - Women's) 8/-13 Review No No No Synthetic N/A N/A N/A PlumaFill 135 + 90 g 10D Recycled nylon ripstop All Round Regular 435 g / 15.3 oz 79 cm / 31 in [Men's / Women's] Arc'teryx Macai LT (Men's) 8/-13 Yes, zips No No Down 750 49 36,750 Coreloft Compact 60 g/m² N40p-X 3L Gore-Tex Ski/Snowboard Regular 855 g / 1 lb 14.2 oz 74 cm / 29.1 in Arc'teryx Seyla (Women's) 8/-13 No No Yes Parka 750 92 69,000 N/A N/A Arato 10 Around Town Regular 507 g / 1 lb. 1.9 oz. 87 cm / 34.4 in [Women's] Patagonia Fitz Roy (Men's - Women's) 8/-13 No Yes No Down 800 128 102,400 N/A N/A 20D Nylon All Round Regular 632 g / 1lb 6.3 oz 74 cm / 29 in [Men's / Women's] Arc'teryx Koda (Men's) 8/-13 No No No Parka N/A N/A N/A Coreloft 80 + 140 g/m² N80p-X Gore-Tex Around Town Regular 720 g / 1 lb 9.4 oz 75 cm / 29.5 in [Men's] Patagonia Vosque 3-in-1 (Women's) 10/-12 Review No No No Parka N/A N/A N/A ThermoLite 100 g 65% nylon, 35% polyester Around Town Regular 1.360 kg / 3 lb 90 cm / 35.5 in [Women's] Patagonia City Storm Down (Men's - Women's) 12/-11 No Yes No Parka 700 191 133,700 N/A N/A 4.2 oz polyester All Round Regular 468 g / 16.5 oz 91 cm / 36 in Patagonia Jackson Glacier (Men's - Women's) 12/-11 Review No No Yes Parka 700 141 98,700 N/A N/A 3.6 oz 50D polyester Around Town Regular 880 g / 1 lb 15 oz 79 cm / 31 in [Men's / Women's] Arc'teryx Sensa (Women's) 14/-10 No No Yes Parka N/A N/A N/A Coreloft Compact 120 g/m² NP100d Gore-Tex 2L Around Town Relaxed 785 g / 1 lb 11.7 oz 86 cm / 34 in Patagonia Hi Loft Down (Men's - Women's) 14/-10 Review No Yes No Down 600 177 106,200 N/A N/A 1.4 oz 30D polyester All Round Regular 540 g / 1 lb 3 oz 76 cm / 30 in [Men's] REI Magma 850 Hoodie 2.0 (Men's - Women's) 14/-10 No Yes No Down 850 120 102,000 N/A N/A Pertex mini ripstop nylon All Round Regular 340 g / 13.75 oz 74 cm / 29.25 in [Men's / Women's] Arc'teryx Beta Insulated Coat (Women's) 16/-9 Review No No Yes Synthetic N/A N/A N/A Coreloft 80 g/m² + 120 g/m² 2L 40D Gore-Tex Around Town Regular 600 g / 1 lb 5.2 oz ? Arc'teryx Atom AR (Men's - Women's) 18/-8 Review Yes, mesh No No Synthetic N/A N/A N/A Coreloft Continuous 120 g/m2 + 80 g/m2 + 60 g/m2 30D Tyono All Round Regular 475 g / 1 lb 74 cm / 29.1 in [Men's / Women's] Patagonia Downdrift (Men's - Women's) 18/-8 No No No Down 600 279 167,400 N/A N/A 4.2 oz polyester Around Town Regular 1.014 kg / 2 lb 3.8 oz ? [Men's / Women's] Arc'teryx Magnus (Men's) 19/-7 No No No Parka N/A N/A N/A Coreloft 80 g N60p Gore-Tex 2L Around Town Regular 690 g / 1 lb 8.3 oz 83 cm / 32.5 in [Men's] Arc'teryx Agrium (Men's - Women's) 21/-6 No Yes No Down 850 117 99,450 N/A N/A Arato All Round Regular 365 g / 12.9 oz 75 cm / 29.5 in Patagonia AlpLight Down (Men's - Women's) 21/-6 No Yes No Down 800 100 80,000 N/A N/A 0.8 oz 10D polyester All Round Slim 270 g / 9.5 oz 74 cm / 29 in [Men's] Arc'teryx Beta Insulated (Men's - Women's) 21/-6 Review Yes, zips No Yes Synthetic N/A N/A N/A Coreloft Continuous 80 g/m² 2L 40D Gore-Tex All Round Regular 680 g / 1 lb 8 oz 78.5 cm / 31 in Patagonia Topley (Men's) 23/-5 No No Yes Down 700 172 120,400 N/A N/A 6 oz polyester All Round Regular 1.133 kg / 2 lb 8 oz 77 cm / 30.5 in [Men's] Arc'teryx Alpha IS (Men's) 23/-5 No Yes Yes Synthetic N/A N/A N/A Coreloft Continuous 65 g/m² N40p-X 2L Gore-Tex Climbing Regular 610 g / 1 lb 5.5 oz 78 cm / 30.75 in [Men's] Rab Xenon 2.0 (Men's - Women's) 23/-5 No Yes Yes Synthetic N/A N/A N/A PrimaLoft Silver 60 g 30D Pertex Quantum All Round Regular 385 g / 13.6 oz 71.5 cm / 28.1 in [Men's / Women's] Patagonia Down Sweater (Men's - Women's) 23/-5 Review No Yes No Down 800 150 120,000 N/A N/A 1.4 oz 20x30D polyester All Round Regular 428 g / 15.1 oz 67 cm / 26.25 in [Men's / Women's] Arc'teryx Ralle Parka (Men's) 25/-4 No No Yes Parka N/A N/A N/A Coreloft 80 g/m² 2L 40D Gore-Tex Around Town Regular 735 g / 1 lb 9.9 oz ? Patagonia Silent Down (Men's - Women's) 26/-3 Review No No No Down 700 109 76,300 N/A N/A 2.2 oz polyester Around Town Regular 585 g / 1 lb 4.7 oz 74 cm / 29 in [Men's / Women's] Arc'teryx Therme Insulated (Men's) 26/-3 Review No No No Synthetic N/A N/A N/A Coreloft Compact 40 g/m² 2L Gore-Tex Around Town Regular 960 g / 2 lb 1.9 oz 73 cm / 28.75 in Arc'teryx Cerium (Men's - Women's) 26/-3 No Yes No Down 850 113 96,050 Coreloft 80 + 100 g/m² Arato 15 All Round Trim 335 g / 11.8 oz ? Mountain Hardwear GW/2 (Men's - Women's) 28/-2 No Yes No Down 800 85 68,000 N/A N/A 10D Ripstop Nylon All Round Trim 250 g / 8.8 oz 70 cm / 27.5 in [Men's / Women's] Arc'teryx Cerium LT (Men's - Women's) 28/-2 Review No Yes No Down 850 102 86,700 Coreloft 80 + 100 g/m² Arato 10 All Round Trim 305 g / 10.8 oz 72 cm / 28.3 in [Men's / Women's] Arc'teryx Nuclei FL (Men's - Women's) 32/0 Review No Yes No Synthetic N/A N/A N/A Coreloft Continuous 65 g/m² Arato 10r Climbing Trim 325 g / 11.5 oz 75 cm / 29.5 in [Men's / Women's] Patagonia DAS Light (Men's - Women's) 34/1 No Yes Yes Synthetic N/A N/A N/A PlumaFill 65 g 0.8-oz 10-denier Pertex Quantum Pro Climbing Regular 320 g / 11.3 oz 77 cm / 30.5 in Patagonia Micro Puff (Men's - Women's) 36/2 Review No Yes No Synthetic N/A N/A N/A PlumaFill 65 g Pertex Quantum All Round Trim 298 g / 10.5 oz 75 cm / 29.5 in [Men's / Women's] Patagonia Isthmus (Men's) 36/2 No No No Parka N/A N/A N/A ThermoGreen 60 g 4.2 oz polyester Around Town Regular 895 g / 1 lb 15.6 oz 70 cm / 27.5 in [Men's] Arc'teryx Proton LT (Men's - Women's) 37/3 Review No No No Synthetic N/A N/A N/A Coreloft Compact 80 g/m2 + 60 g/m2 Fortius Air 20 Climbing Trim 375 g / 13.2 oz 75 cm / 29.4 in [Men's / Women's] Patagonia Nano Puff (Men's - Women's) 37/3 Review No Yes No Synthetic N/A N/A N/A PrimaLoft Gold Insulation Eco 60 g 22D Polyester All Round Regular 363 g / 12.8 oz 71.5 cm / 28 in [Men's / Women's] Arc'teryx Norvan SL Ins. (Men's - Women's) 39/4 No Yes No Synthetic N/A N/A N/A Coreloft Compact 40 g/m² Gore-Tex ShakeDry Running Trim 270 g / 9.5 oz 71.5 cm / 28.1 in [Men's / Women's] Patagonia Nano Air (Men's - Women's) 41/5 Review No No No Synthetic N/A N/A N/A FullRange 60 g 33D Nylon ripstop All Round Trim 318 g / 11.2 oz ? [Men's / Women's] Arc'teryx Atom LT (Men's - Women's) 43/6 Review Yes, mesh No No Synthetic N/A N/A N/A Coreloft Continuous 60 g/m² 20D Tyono All Round Trim 375 g / 13.2 oz 74 cm / 29.1 in [Men's / Women's] Arc'teryx Cerium SL (Men's - Women's) 43/6 Review No Yes No Down 850 58 49,300 Coreloft 40 + 100 g/m² Arato 7 All Round Trim 215 g / 7.6 oz 69 cm / 27.2 in [Men's / Women's] Arc'teryx Proton Hybrid (Men's - Women's) 46/8 Review No No No Synthetic N/A N/A N/A Coreloft Compact 40 g/m² Fortius™ Air 50 All Round Trim 365 g / 12.9 oz ? [Women's] Arc'teryx Proton FL (Men's) 48/9 Review No No No Synthetic N/A N/A N/A Octa Loft 94 g/m² Fortius Air 20 Climbing Trim 323 g / 11.4 oz 77 cm / 30.4 in [Men's / Women's] Arc'teryx Atom SL (Men's - Women's) 52/11 Review Yes, mesh No No Synthetic N/A N/A N/A Coreloft Compact 40 g/m² 20D Tyono All Round Trim 245 g / 8.6 oz 72 cm / 28.3 in [Men's / Women's] REI Stormhenge Hybrid (Men's - Women's) Testing Yes, zips No No Down 850 ? N/A N/A 40D + 80D All Round Regular 900 g / 1 lb 15.75 oz 80 cm / 31.5 in [Men's / Women's] Arc'teryx Monitor Insulated (Women's) Testing No No Yes Parka N/A N/A N/A Coreloft 80 + 100 g/m² 40D 3L Gore-Tex Around Town Oversized 645 g / 1 lb 6.8 oz 93 cm / 37 in Arc'teryx Coelle (Women's) Testing No No Yes Parka N/A N/A N/A Coreloft 80 + 140 g/m² 40D 2L Gore-Tex Around Town Regular 460 g / 1 lb 0.2 oz 93 cm / 37 in
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.