Arc’teryx Proton vs Atom | How to decide + our temperature ratings

Last updated: February 12, 2025

Arc'teryx Proton vs Atom jacket comparison

The current lineup of men's Arc'teryx Proton and Atom jackets includes (clockwise from top left): the Proton Hybrid Hoody, Proton Hoody, Proton Heavyweight Hoody, Atom Heavyweight Hoody, Atom Hoody, and Atom SL. 

Arc'teryx Atom vs Proton: Overview

We've owned every model of Atom and Proton from recent years, including the Proton Hybrid, Proton Lightweight, Proton, Proton Heavyweight, Atom SL, Atom, and Atom Heavyweight. 

  • Proton Heavyweight vs Atom Heavyweight (aka Atom AR): Perfect picks for cold weather. If I had to choose one, I'd go with the Proton Heavyweight (breathes better, has more pockets, and is more abrasion resistant). I also happen to think it's more comfortable. If, however, I wanted to maximize warmth and wind resistance at all costs, I'd go with the Atom Heavyweight
  • Proton vs Atom (aka Atom LT): They're very similar, and both are excellent for both high-output activities and casual use. The Proton offers a bit more abrasion resistance; the Atom offers a bit more breathability. 
  • Proton Lightweight vs Atom SL (women's version is called the Atom Lightweight): Ideal for high-output activities and casual use during chilly spring and summer mornings. The Proton Lightweight (currently available only in women's) offers a bit more abrasion resistance and has one more pocket. The Atom SL (men's) / Atom Lightweight (women's) is more of an all-arounder, offers a bit more breathability and is very slightly insulated only in the body.

Arc'teryx Atom vs Proton: Summary

I find Proton Lightweight extremely comfortable.

I love the Proton Lightweight. Terrific fit and comfort. I'm 5'11", 165 pounds, athletic build and size medium fits me perfectly. Delivers that top-notch quality feeling, too. 

To choose between the current lineup of Arc'teryx Atom and Proton jackets, you should first determine the warmth you need. Refer to the table at the beginning of the article for our temperature ratings.

Now you know if you need a heavyweight model, a base model, or a lightweight model. And you only have to decide between Atom and Proton. 

All Atoms offer performance fleece stretch side panels for increased mobility and breathability. It doesn't work quite as well in the Atom Heavyweight, but it works perfectly with the Atom and Atom SL because those fleece side panels are much longer. 

All Atoms also come with a StormHood, unlike the Protons that come with a standard hood. (https://outdoorcrunch.com/stormhood-vs-drophood/)

I personally find the Protons a bit more suitable for high-abrasion activities - think climbing, skiing and/or backpack use without a shell. 

Atoms, on the other hand, are a bit more suitable for all-round use and/or if you use the hood a lot. Think a combination of a variety of high-output activities. It's perfectly fine for climbing, skiing and/or heavy backpack use as well, just not quite as abrasion-resistant as the Protons.

The differences between the same line (heavyweight, base, lightweight) Atom vs Proton might not be that noticeable to you in practice. So if you care about the looks of your jackets as much as their performance, I don't see anything wrong in going after the model you think looks best - especially if you're planning to wear your jacket casually around town. 

In other words, as long as you get the weight right (heavyweight vs base vs lightweight variants), whether you go with an Atom or a Proton model shouldn't matter a ton. 

You might also want to check out Arc'teryx's Naming Scheme page, which describes both the Atom and Proton lines. 

The Proton Hybrid Hoody (Men's - Women's - read review) is different enough from the other models that I don't think it belongs in an Atom vs Proton comparison, so I won't mention it here. 

Naming changes

After changing the names of some women's jackets last season (Fall/Winter 2023), this season Arc'teryx moved to make the same changes for the men's versions as well.

  • Atom AR → Atom Heavyweight
  • Atom LT → Atom
  • Atom SL → Atom Lightweight (the change still has not taken place in the men's version)
  • Proton LT → Proton
  • Proton FL → Proton Lightweight
  • Proton Heavyweight
  • Proton Hybrid Hoody

Changes are exclusive to the naming and fit. Structural designs remain the same. The fit is being updated universally for all Arc'teryx jackets. 

  • Temperature ratings of Arc'teryx jackets

NameEst. Temp (F/C)BreathabilityWind Res.Abrasion res.PackabilityBest pick forReviewPit venting?Two way zipper?Stuffs into itself?TypeFill Power (in3/oz)Fill Weight (g)Fill Volume (in3)Synthetic FillSynth. Fill WeightFace FabricActivityFitWeightLength (CB)Internal pocketsExternal pocketssentences
Arc'teryx Alpha Parka (Men's - Women's)-18/-28No dataNo dataNo dataNo dataWarmest Arc'teryx jacket. ReviewNoYesYesDown8502968,875Coreloft90 g/m²N30r 2L GoreTex InfiniumClimbingRegular805 g / 1 lb 12.4 oz86 cm / 34 inNobestdownjacketsFill weight of Arc'teryx Alpha Parka (Men's - Women's) is 296 grams. Its fill power is 850 cubic inches per ounce, which equals to a total of 8875 cubic inches of down fill volume. It's also reinforced with 90 g/m² of Coreloft.
Arc'teryx Alpha Lightweight (Men's - Women's)5/-15No dataNo dataNo dataNo dataNoYesYesDown8501173,508Coreloft Compact40 g/m²Hadron 2L Gore-Tex InfiniumClimbingRegular540 g / 1 lb 3 oz79.5 cm / 31.25 inNobestdownjacketsFill weight of Arc'teryx Alpha Lightweight (Men's - Women's) is 117 grams. Its fill power is 850 cubic inches per ounce, which equals to a total of 3508 cubic inches of down fill volume. It's also reinforced with 40 g/m² of Coreloft Compact.
Arc'teryx Atom (aka LT) ( Men's - Women's)43/69/106/107/105/10High output activities. ReviewYes, meshNoNoSyntheticN/AN/AN/ACoreloft Continuous60 g/m²20D TyonoAll RoundTrim375 g / 13.2 oz74 cm / 29.1 inNoatomprotonbestsyntheticjackets1x chest-Arc'teryx Atom (aka LT) ( Men's - Women's) is equipped with 60 g/m² of Coreloft Continuous.
Arc'teryx Atom Heavyweight (aka AR) (Men's - Women's)18/-84/108/108/103/10ReviewYes, meshNoNoSyntheticN/AN/AN/ACoreloft Continuous120 g/m2 + 80 g/m2 + 60 g/m230D TyonoAll RoundRegular475 g / 1 lb 74 cm / 29.1 inNoatomprotonbestsyntheticjackets1x chest-Arc'teryx Atom Heavyweight (aka AR) (Men's - Women's) is equipped with 120 g/m2 + 80 g/m2 + 60 g/m2 of Coreloft Continuous.
Arc'teryx Atom Lightweight (aka SL) (Men's - Women's)52/1110/102/107/106/10ReviewYes, meshNoNoSyntheticN/AN/AN/ACoreloft Compact40 g/m²20D TyonoAll RoundTrim270 g / 9.5 oz72 cm / 28.3 inNoatomprotonbestsyntheticjackets--Arc'teryx Atom Lightweight (aka SL) (Men's - Women's) is equipped with 40 g/m² of Coreloft Compact.
Arc'teryx Beta Down Insulated (Men's)0/-18No dataNo dataNo dataNo dataYesYesNoParka8501263,778Coreloft80 g/m²2L 40D Gore-TexAll RoundRegular760 g / 1 lb 10.8 oz79 cm / 31 inNobestdownjacketsFill weight of Arc'teryx Beta Down Insulated (Men's) is 126 grams. Its fill power is 850 cubic inches per ounce, which equals to a total of 3778 cubic inches of down fill volume. It's also reinforced with 80 g/m² of Coreloft.
Arc'teryx Beta Insulated (Men's)21/-6No dataNo dataNo dataNo dataReviewYes, zipsYesNoParkaN/AN/AN/ACoreloft Continuous80 g/m²2L 40D Gore-TexAll RoundRegular680 g / 1 lb 8 oz78.5 cm / 31 inNoArc'teryx Beta Insulated (Men's) is equipped with 80 g/m² of Coreloft Continuous.
Arc'teryx Beta Insulated Coat (Women's)16/-9No dataNo dataNo dataTestingReviewNoYesNoParkaN/AN/AN/ACoreloft 80 g/m² + 120 g/m²2L 40D Gore-TexAround TownRegular600 g / 1 lb 5.2 oz86 cm / 34 inNoArc'teryx Beta Insulated Coat (Women's) is equipped with 80 g/m² + 120 g/m² of Coreloft .
Arc'teryx Cerium (aka LT) (Men's - Women's)26/-3No dataNo dataNo dataNo dataLight down jacket. ReviewNoNoYesDown8501133,388Coreloft80 + 100 g/m²Arato 15All RoundTrim335 g / 11.8 oz72 cm / 28.3 inNobestdownjacketsFill weight of Arc'teryx Cerium (aka LT) (Men's - Women's) is 113 grams. Its fill power is 850 cubic inches per ounce, which equals to a total of 3388 cubic inches of down fill volume. It's also reinforced with 80 + 100 g/m² of Coreloft.
Arc'teryx Cerium Hybrid (Women's)44/7No dataNo dataNo dataNo dataNoNoYesDown850441,319Coreloft40 + 100 g/m²Arato 15 + Fortius Air 50All RoundTrim260 g / 9.2 oz70 cm / 27.5 inNobestdownjackets#REF!
Arc'teryx Coelle (Women's)14/-10No dataNo dataNo dataNo dataNoYesNoParkaN/AN/AN/ACoreloft98 g/m²40D 2L Gore-TexAround TownRegular435g / 15.3 oz70 cm / 27.5 inNoArc'teryx Cerium Hybrid (Women's) is equipped with 98 g/m² of Coreloft.
Arc'teryx Liatris (Women's)5/-15No dataNo dataNo dataNo dataNoNoNoParka850932,788Climashield80 g/m2 + 60 g/m270D 3L Gore-TexAround TownRegular890 g / 1 lb 15.4 oz75 cm / 29.5 inNoFill weight of Arc'teryx Liatris (Women's) is 93 grams. Its fill power is 850 cubic inches per ounce, which equals to a total of 2788 cubic inches of down fill volume. It's also reinforced with 80 g/m2 + 60 g/m2 of Climashield.
Arc'teryx Liatris Parka (Women's)2/-17No dataNo dataNo dataNo dataNoNoNoParka8501364,078Climashield80 g/m2 + 60 g/m270D 3L Gore-TexAround TownRegular1.093 kg / 2 lb 6.6 oz109 cm / 43 inNoFill weight of Arc'teryx Liatris Parka (Women's) is 136 grams. Its fill power is 850 cubic inches per ounce, which equals to a total of 4078 cubic inches of down fill volume. It's also reinforced with 80 g/m2 + 60 g/m2 of Climashield.
Arc'teryx Nuclei (aka FL) ( Men's - Women's)32/02/109/102/1010/10ReviewNoNoYesSyntheticN/AN/AN/ACoreloft Continuous65 g/m²Arato 10rAll RoundRegular325 g / 11.5 oz75 cm / 29.5 inNonucleiprotonbestsyntheticjackets2x dump-Arc'teryx Nuclei (aka FL) ( Men's - Women's) is equipped with 65 g/m² of Coreloft Continuous.
Arc'teryx Nuclei SV (Women's)5/-151/1010/102/108/10Warmest belay jacket. ReviewNoYesYesSyntheticN/AN/AN/ACoreloft Continuous190 g/m2 + 90 g/m2Arato 15All RoundRegular600 g / 1 lb 5.2 oz81 cm / 31.8 inNonucleiprotonbestsyntheticjackets2x dump1x chestArc'teryx Nuclei SV (Women's) is equipped with 190 g/m2 + 90 g/m2 of Coreloft Continuous.
Arc'teryx Patera (Women's)21/-6No dataNo dataNo dataNo dataReviewNoYesNoParka750671,773Coreloft60 + 80 g/m²2L Gore-TexAround TownTrim867 g / 1 lb 14.6 oz99 cm / 39 inNoFill weight of Arc'teryx Patera (Women's) is 67 grams. Its fill power is 750 cubic inches per ounce, which equals to a total of 1773 cubic inches of down fill volume. It's also reinforced with 60 + 80 g/m² of Coreloft.
Arc'teryx Patera Long (Women's)0/-18No dataNo dataNo dataNo dataWomen's warmest parka. NoYesNoParka7502045,397Coreloft60 + 80 g/m²2L Gore-TexAround TownRegular1.1 kg / 2 lb 6.8 oz117.5 cm / 46.25 inNoFill weight of Arc'teryx Patera Long (Women's) is 204 grams. Its fill power is 750 cubic inches per ounce, which equals to a total of 5397 cubic inches of down fill volume. It's also reinforced with 60 + 80 g/m² of Coreloft.
Arc'teryx Proton Lightweight (aka FL) (Men's - Women's)48/98/104/107/106/10Chilly summer mornings.ReviewNoNoNoSyntheticN/AN/AN/AOcta Loft94 g/m²Fortius Air 20ClimbingTrim343 g / 12.1 oz75 cm / 29.5 inNoatomprotonnucleiprotonbestsyntheticjackets-1x chestArc'teryx Proton Lightweight (aka FL) (Men's - Women's) is equipped with 94 g/m² of Octa Loft.
Arc'teryx Therme Parka (Men's)5/-15No dataNo dataNo dataNo dataReviewNoYesNoParka7501203,175Coreloft60 + 80 g/m²P75d PolyesterAround TownRegular991 g / 2 lb 3 oz85 cm / 33.5 inNoFill weight of Arc'teryx Therme Parka (Men's) is 120 grams. Its fill power is 750 cubic inches per ounce, which equals to a total of 3175 cubic inches of down fill volume. It's also reinforced with 60 + 80 g/m² of Coreloft.
Arc'teryx Therme SV (Men's)-11/-24No dataNo dataNo dataNo dataMen's warmest parka. ReviewNoYesNoParka7502115,582Coreloft60 g/m²2L Gore-TexAround TownRegular1.072 kg / 2 lb 5.8 oz96 cm / 37.75 inNoFill weight of Arc'teryx Therme SV (Men's) is 211 grams. Its fill power is 750 cubic inches per ounce, which equals to a total of 5582 cubic inches of down fill volume. It's also reinforced with 60 g/m² of Coreloft.
Arc'teryx Thorium ( Men's - Women's)12/-11No dataNo dataNo dataNo dataWarm down jacket.ReviewNoYesYesDown7501403,704Coreloft80 + 140 g/m²Arato 30All RoundRegular517 g / 1 lb 2.2 oz71.5 cm / 28.1 inNobestdownjacketsFill weight of Arc'teryx Thorium ( Men's - Women's) is 140 grams. Its fill power is 750 cubic inches per ounce, which equals to a total of 3704 cubic inches of down fill volume. It's also reinforced with 80 + 140 g/m² of Coreloft.
Arc'teryx Thorium Parka (Women's)-2/-19No dataNo dataNo dataNo dataReviewNoYesNoDown7502095,529Coreloft80 + 140 g/m²Arato 20Around TownRegular610 g / 1 lb 5.5 oz115.8 cm / 45.6 inNoFill weight of Arc'teryx Thorium Parka (Women's) is 209 grams. Its fill power is 750 cubic inches per ounce, which equals to a total of 5529 cubic inches of down fill volume. It's also reinforced with 80 + 140 g/m² of Coreloft.
Arc'teryx Thorium SV (Men's)3/-16No dataNo dataNo dataNo dataGore-Tex down jacket.NoYesYesDown7501694,471Coreloft80 + 140 g/m²Arato 30 & 2L Gore-Tex InfiniumAround TownRegular645 g / 1 lb 6.8 oz73 cm / 28.75 inNobestdownjacketsFill weight of Arc'teryx Thorium SV (Men's) is 169 grams. Its fill power is 750 cubic inches per ounce, which equals to a total of 4471 cubic inches of down fill volume. It's also reinforced with 80 + 140 g/m² of Coreloft.
Arc'teryx Thorium SV Parka (Men's)0/-18No dataNo dataNo dataNo dataNoYesNoDown7501955,159Coreloft80 + 140 g/m²Arato 30 & 2L Gore-Tex InfiniumAround TownRegular685 g / 1 lb 8.2 oz85 cm / 33.5 inNobestdownjacketsFill weight of Arc'teryx Thorium SV Parka (Men's) is 195 grams. Its fill power is 750 cubic inches per ounce, which equals to a total of 5159 cubic inches of down fill volume. It's also reinforced with 80 + 140 g/m² of Coreloft.
Black Diamond Access Down (Men's - Women's)7/-14No dataNo dataNo dataNo dataNoYesYesDown7001553,827N/AN/A30D ripstop nylonAll RoundRegular442 g / 15.6 oz76 cm / 29.75 inNoFill weight of Black Diamond Access Down (Men's - Women's) is 155 grams. Its fill power is 700 cubic inches per ounce, which equals to a total of 3827 cubic inches of down fill volume.
Feathered Friends Eos(Men's - Women's)8/-13No dataNo dataNo dataNo dataNoNoYesDown9001053,333N/AN/APertex QuantumAll RoundRegular306 g / 10.8 oz?NoFill weight of Feathered Friends Eos(Men's - Women's) is 105 grams. Its fill power is 900 cubic inches per ounce, which equals to a total of 3333 cubic inches of down fill volume.
Feathered Friends Khumbu (Men's)-17/-27No dataNo dataNo dataNo dataNoNoYesDown90037812,000Primaloft Gold200 gPretex Shield XTAll RoundRegular960 g / 2 lb 2 oz?NoFill weight of Feathered Friends Khumbu (Men's) is 378 grams. Its fill power is 900 cubic inches per ounce, which equals to a total of 12000 cubic inches of down fill volume. It's also reinforced with 200 g of Primaloft Gold.
Mountain Equipment Exo (Men's)-10/-23No dataNo dataNo dataNo dataNoYesYesDown8002657,478N/AN/ANylonAll RoundRegular770 g / 1 lb 11.2 oz79 cm / 31 inNoFill weight of Mountain Equipment Exo (Men's) is 265 grams. Its fill power is 800 cubic inches per ounce, which equals to a total of 7478 cubic inches of down fill volume.
Mountain Equipment K7 (Men's)-13/-25No dataNo dataNo dataNo dataNoYesYesDown8003008,466N/AN/A30D DriliteAll RoundRegular820 g / 1 lb 13 oz76 cm / 30 inNoFill weight of Mountain Equipment K7 (Men's) is 300 grams. Its fill power is 800 cubic inches per ounce, which equals to a total of 8466 cubic inches of down fill volume.
Mountain Hardwear GW/2 (Men's - Women's)28/-2No dataNo dataNo dataNo dataNoNoYesDown800852,399N/AN/A10D Ripstop NylonAll RoundTrim250 g / 8.8 oz70 cm / 27.5 inNoFill weight of Mountain Hardwear GW/2 (Men's - Women's) is 85 grams. Its fill power is 800 cubic inches per ounce, which equals to a total of 2399 cubic inches of down fill volume.
Outdoor Research Sup. Alp. (Men's - Women's)3/-16No dataNo dataNo dataNo dataNoYesNoDown8001825,136N/AN/A30D Pertex Quantum ProAll RoundRegular825 g / 1 lb 13.1 oz85 cm / 33.5 inNoFill weight of Outdoor Research Sup. Alp. (Men's - Women's) is 182 grams. Its fill power is 800 cubic inches per ounce, which equals to a total of 5136 cubic inches of down fill volume.
Patagonia AlpLight (Men's - Women's)36/2No dataNo dataNo dataNo dataNoNoYesDown8001002,822N/AN/A0.8 oz 10D polyesterAll RoundSlim270 g / 9.5 oz74 cm / 29 inNoFill weight of Patagonia AlpLight (Men's - Women's) is 100 grams. Its fill power is 800 cubic inches per ounce, which equals to a total of 2822 cubic inches of down fill volume.
Patagonia AlpLoft (Men's)-10/-23No dataNo dataNo dataNo dataNoYesYesDown8002958,325N/AN/APertex QuantomAll RoundRegular680 g / 1 lb 8 oz81 cm / 31.8 inNoFill weight of Patagonia AlpLoft (Men's) is 295 grams. Its fill power is 800 cubic inches per ounce, which equals to a total of 8325 cubic inches of down fill volume.
Patagonia DAS (Men's - Women's)10/-121/109/103/106/10ReviewNoYesYesSyntheticN/AN/AN/APrimaLoft Gold Insulation Eco133 + 40 gPertex Quantum ProAll RoundRegular555 g / 1 lb 3.6 oz84 cm / 33 inNobestsyntheticjackets2x dump1x chestPatagonia DAS (Men's - Women's) is equipped with 133 + 40 g of PrimaLoft Gold Insulation Eco.
Patagonia DAS Light(Men's)34/12/108/102/109/10ReviewNoYesYesSyntheticN/AN/AN/APlumaFill65 g10D Pertex Quantum ProAll RoundRegular320 g / 11.3 oz77 cm / 30.5 inNobestsyntheticjackets-1x chestPatagonia DAS Light(Men's) is equipped with 65 g of PlumaFill.
Patagonia Down Sweater (Men's - Women's)23/-5No data4/106/107/10ReviewNoNoYesDown8001504,233N/AN/A1.4 oz 20x30D polyesterAll RoundRegular428 g / 15.1 oz67 cm / 26.25 inNoFill weight of Patagonia Down Sweater (Men's - Women's) is 150 grams. Its fill power is 800 cubic inches per ounce, which equals to a total of 4233 cubic inches of down fill volume.
Patagonia Downdrift (Men's - Women's)18/-8No dataNo dataNo dataNo dataNoNoNoDown6002795,905N/AN/A4.2 oz polyesterAround TownRegular1.014 kg / 2 lb 3.8 oz?NoFill weight of Patagonia Downdrift (Men's - Women's) is 279 grams. Its fill power is 600 cubic inches per ounce, which equals to a total of 5905 cubic inches of down fill volume.
Patagonia Fitz Roy (Men's - Women's)14/-10No dataNo dataNo dataNo dataNoNoYesDown8001283,612N/AN/A20D NylonAll RoundRegular632 g / 1lb 6.3 oz74 cm / 29 inNoFill weight of Patagonia Fitz Roy (Men's - Women's) is 128 grams. Its fill power is 800 cubic inches per ounce, which equals to a total of 3612 cubic inches of down fill volume.
Patagonia Isthmus (Men's)36/2No dataNo dataNo dataNo dataNoNoNoParkaN/AN/AN/AThermoGreen60 g4.2 oz polyesterAround TownRegular895 g / 1 lb 15.6 oz70 cm / 27.5 inNoPatagonia Isthmus (Men's) is equipped with 60 g of ThermoGreen.
Patagonia Jackson Glacier (Men's - Women's)12/-11No dataNo dataNo dataNo dataReviewNoYesNoDown7001413,482N/AN/A3.6 oz 50D polyesterAround TownRegular880 g / 1 lb 15 oz79 cm / 31 inNoFill weight of Patagonia Jackson Glacier (Men's - Women's) is 141 grams. Its fill power is 700 cubic inches per ounce, which equals to a total of 3482 cubic inches of down fill volume.
Patagonia Jackson Glacier Parks ( Women's)7/-14No dataNo dataNo dataNo dataNoNoNoParka7002185,383N/AN/A50D PolyesterAround TownRegular1.142 kg / 2 lb 8.3 oz?NoFill weight of Patagonia Jackson Glacier Parks ( Women's) is 218 grams. Its fill power is 700 cubic inches per ounce, which equals to a total of 5383 cubic inches of down fill volume.
Patagonia Micro Puff (Men's - Women's)37/35/106/105/108/10ReviewNoNoYesSyntheticN/AN/AN/APlumaFill65 gPertex QuantumAll RoundRegular298 g / 10.5 oz75 cm / 29.5 inNobestsyntheticjackets2x dump-Patagonia Micro Puff (Men's - Women's) is equipped with 65 g of PlumaFill.
Patagonia Nano Air (Men's - Women's)39/47/105/105/108/10ReviewNoNoYesSyntheticN/AN/AN/AFullRange60 g33D nylon ripstopAll RoundTrim401 g / 14.14 oz?Nobestsyntheticjackets-2x chestPatagonia Nano Air (Men's - Women's) is equipped with 60 g of FullRange.
Patagonia Nano Air Light Hybrid (Men's - Women's)50/10No dataNo dataNo dataNo dataNoNoNoSyntheticN/AN/AN/AFullRange40 g20D nylon ripstopAll RoundTrim335 g / 11.8 oz?NoPatagonia Nano Air Light Hybrid (Men's - Women's) is equipped with 40 g of FullRange.
Patagonia Nano Puff (Men's - Women's)41/54/106/106/108/10ReviewNoNoYesSyntheticN/AN/AN/APrimaLoft Gold Insulation Eco60 g22D PolyesterAll RoundRegular363 g / 12.8 oz71.5 cm / 28 inNobestsyntheticjackets1x chest-Patagonia Nano Puff (Men's - Women's) is equipped with 60 g of PrimaLoft Gold Insulation Eco.
Patagonia Silent Down (Men's - Women's)26/-3No dataNo dataNo dataNo dataReviewNoNoNoDown7001092,691N/AN/A2.2 oz polyesterAround TownRegular585 g / 1 lb 4.7 oz74 cm / 29 inNoFill weight of Patagonia Silent Down (Men's - Women's) is 109 grams. Its fill power is 700 cubic inches per ounce, which equals to a total of 2691 cubic inches of down fill volume.
Patagonia Stormshadow (Men's)0/-18No dataNo dataNo dataNo dataNoNoNoParka7002596,395N/AN/A75D PolyesterAround TownRegular1.182 kg / 2 lb 9.7 oz?NoFill weight of Patagonia Stormshadow (Men's) is 259 grams. Its fill power is 700 cubic inches per ounce, which equals to a total of 6395 cubic inches of down fill volume.
Patagonia Tres 3-in-1Patagonia Tres 3-in-1 (Men's - Women's)8/-13No dataNo dataNo dataNo dataReviewNoNoNoParka7001182,914N/AN/A5.5 oz polyesterAround TownRegular1.307 kg / 2 lb 14.1 oz85 cm / 33.5 inNoFill weight of Patagonia Tres 3-in-1Patagonia Tres 3-in-1 (Men's - Women's) is 118 grams. Its fill power is 700 cubic inches per ounce, which equals to a total of 2914 cubic inches of down fill volume.
Patagonia Vosque 3-in-1 (Women's)10/-12No dataNo dataNo dataNo dataReviewNoNoNoParkaN/AN/AN/AThermoLite100 g65% nylon, 35% polyesterAround TownRegular1.360 kg / 3 lb90 cm / 35.5 inNoPatagonia Vosque 3-in-1 (Women's) is equipped with 100 g of ThermoLite.
Rab Electron Pro (Men's - Women's)5/-15No dataNo dataNo dataNo dataNoYesYesDown8001805,079N/AN/A20D Pertex Quantum ProAll RoundRegular525 g / 1 lb 2.5 oz74 cm / 29 inNoFill weight of Rab Electron Pro (Men's - Women's) is 180 grams. Its fill power is 800 cubic inches per ounce, which equals to a total of 5079 cubic inches of down fill volume.
Rab Infinity Alpine (Men's)5/-15No dataNo dataNo dataNo dataNoYesYesDown8001754,938N/AN/A30D & 13D Gore-Tex InfiniumAll RoundRegular551 g / 1 lb 3.4 oz76.5 cm / 30.1 inNoFill weight of Rab Infinity Alpine (Men's) is 175 grams. Its fill power is 800 cubic inches per ounce, which equals to a total of 4938 cubic inches of down fill volume.
Rab Infinity Microlight (Men's - Women's)19/-7No dataNo dataNo dataNo dataNoNoYesDown7001463,605N/AN/A13D Gore-Tex InfiniumAll RoundRegular452 g / 15.9 oz74 cm / 29.1 inNoFill weight of Rab Infinity Microlight (Men's - Women's) is 146 grams. Its fill power is 700 cubic inches per ounce, which equals to a total of 3605 cubic inches of down fill volume.
Rab Microlight Alpine (Men's - Women's)7/-14No dataNo dataNo dataNo dataNoNoYesDown7001533,778N/AN/A30D Pertex QuantumAll RoundRegular466 g / 1 lb 0.5 oz72 cm / 28.5 inNoFill weight of Rab Microlight Alpine (Men's - Women's) is 153 grams. Its fill power is 700 cubic inches per ounce, which equals to a total of 3778 cubic inches of down fill volume.
Rab Neutrino Pro (Men's - Women's)-2/-19No dataNo dataNo dataNo dataNoYesYesDown8002125,982N/AN/A20D Pertex Quantum ProAll RoundRegular585 g / 1 lb 8.6 oz77 cm / 30.3 inNoFill weight of Rab Neutrino Pro (Men's - Women's) is 212 grams. Its fill power is 800 cubic inches per ounce, which equals to a total of 5982 cubic inches of down fill volume.
Rab Positron Pro (Men's)-13/-25No dataNo dataNo dataNo dataNoYesYesDown8003008,466N/AN/A40D Pertex Quantum ProAll RoundRegular740 g / 1 lb 10 oz85 cm / 33.5 inNoFill weight of Rab Positron Pro (Men's) is 300 grams. Its fill power is 800 cubic inches per ounce, which equals to a total of 8466 cubic inches of down fill volume.
REI Magma 850 Hoodie 2.0 (Men's - Women's)14/-10No dataNo dataNo dataNo dataNoNoYesDown8501203,598N/AN/APertex mini ripstop nylonAll RoundRegular340 g / 13.75 oz74 cm / 29.25 inNoFill weight of REI Magma 850 Hoodie 2.0 (Men's - Women's) is 120 grams. Its fill power is 850 cubic inches per ounce, which equals to a total of 3598 cubic inches of down fill volume.
 

Assumptions: Worn over a thin shirt, no output, no precipitation, light to no wind. Values are always for size M and for men's, except for women's-only items. 

Primary use of this spectrum is for comparison, rather than figuring out absolute temp ratings. 

  • Performance ratings of Arc'teryx synthetics

NameEst. Temp (F/C)BreathabilityWind Res.Abrasion res.PackabilityBest pick forReviewPit venting?Two way zipper?Stuffs into itself?TypeFill Power (in3/oz)Fill Weight (g)Fill Volume (in3)Synthetic FillSynth. Fill WeightFace FabricActivityFitWeightLength (CB)Internal pocketsExternal pocketssentences
Arc'teryx Alpha Parka (Men's - Women's)-18/-28No dataNo dataNo dataNo dataWarmest Arc'teryx jacket. ReviewNoYesYesDown8502968,875Coreloft90 g/m²N30r 2L GoreTex InfiniumClimbingRegular805 g / 1 lb 12.4 oz86 cm / 34 inNobestdownjacketsFill weight of Arc'teryx Alpha Parka (Men's - Women's) is 296 grams. Its fill power is 850 cubic inches per ounce, which equals to a total of 8875 cubic inches of down fill volume. It's also reinforced with 90 g/m² of Coreloft.
Arc'teryx Alpha Lightweight (Men's - Women's)5/-15No dataNo dataNo dataNo dataNoYesYesDown8501173,508Coreloft Compact40 g/m²Hadron 2L Gore-Tex InfiniumClimbingRegular540 g / 1 lb 3 oz79.5 cm / 31.25 inNobestdownjacketsFill weight of Arc'teryx Alpha Lightweight (Men's - Women's) is 117 grams. Its fill power is 850 cubic inches per ounce, which equals to a total of 3508 cubic inches of down fill volume. It's also reinforced with 40 g/m² of Coreloft Compact.
Arc'teryx Atom (aka LT) ( Men's - Women's)43/69/106/107/105/10High output activities. ReviewYes, meshNoNoSyntheticN/AN/AN/ACoreloft Continuous60 g/m²20D TyonoAll RoundTrim375 g / 13.2 oz74 cm / 29.1 inNoatomprotonbestsyntheticjackets1x chest-Arc'teryx Atom (aka LT) ( Men's - Women's) is equipped with 60 g/m² of Coreloft Continuous.
Arc'teryx Atom Heavyweight (aka AR) (Men's - Women's)18/-84/108/108/103/10ReviewYes, meshNoNoSyntheticN/AN/AN/ACoreloft Continuous120 g/m2 + 80 g/m2 + 60 g/m230D TyonoAll RoundRegular475 g / 1 lb 74 cm / 29.1 inNoatomprotonbestsyntheticjackets1x chest-Arc'teryx Atom Heavyweight (aka AR) (Men's - Women's) is equipped with 120 g/m2 + 80 g/m2 + 60 g/m2 of Coreloft Continuous.
Arc'teryx Atom Lightweight (aka SL) (Men's - Women's)52/1110/102/107/106/10ReviewYes, meshNoNoSyntheticN/AN/AN/ACoreloft Compact40 g/m²20D TyonoAll RoundTrim270 g / 9.5 oz72 cm / 28.3 inNoatomprotonbestsyntheticjackets--Arc'teryx Atom Lightweight (aka SL) (Men's - Women's) is equipped with 40 g/m² of Coreloft Compact.
Arc'teryx Beta Down Insulated (Men's)0/-18No dataNo dataNo dataNo dataYesYesNoParka8501263,778Coreloft80 g/m²2L 40D Gore-TexAll RoundRegular760 g / 1 lb 10.8 oz79 cm / 31 inNobestdownjacketsFill weight of Arc'teryx Beta Down Insulated (Men's) is 126 grams. Its fill power is 850 cubic inches per ounce, which equals to a total of 3778 cubic inches of down fill volume. It's also reinforced with 80 g/m² of Coreloft.
Arc'teryx Beta Insulated (Men's)21/-6No dataNo dataNo dataNo dataReviewYes, zipsYesNoParkaN/AN/AN/ACoreloft Continuous80 g/m²2L 40D Gore-TexAll RoundRegular680 g / 1 lb 8 oz78.5 cm / 31 inNoArc'teryx Beta Insulated (Men's) is equipped with 80 g/m² of Coreloft Continuous.
Arc'teryx Beta Insulated Coat (Women's)16/-9No dataNo dataNo dataTestingReviewNoYesNoParkaN/AN/AN/ACoreloft 80 g/m² + 120 g/m²2L 40D Gore-TexAround TownRegular600 g / 1 lb 5.2 oz86 cm / 34 inNoArc'teryx Beta Insulated Coat (Women's) is equipped with 80 g/m² + 120 g/m² of Coreloft .
Arc'teryx Cerium (aka LT) (Men's - Women's)26/-3No dataNo dataNo dataNo dataLight down jacket. ReviewNoNoYesDown8501133,388Coreloft80 + 100 g/m²Arato 15All RoundTrim335 g / 11.8 oz72 cm / 28.3 inNobestdownjacketsFill weight of Arc'teryx Cerium (aka LT) (Men's - Women's) is 113 grams. Its fill power is 850 cubic inches per ounce, which equals to a total of 3388 cubic inches of down fill volume. It's also reinforced with 80 + 100 g/m² of Coreloft.
Arc'teryx Cerium Hybrid (Women's)44/7No dataNo dataNo dataNo dataNoNoYesDown850441,319Coreloft40 + 100 g/m²Arato 15 + Fortius Air 50All RoundTrim260 g / 9.2 oz70 cm / 27.5 inNobestdownjackets#REF!
Arc'teryx Coelle (Women's)14/-10No dataNo dataNo dataNo dataNoYesNoParkaN/AN/AN/ACoreloft98 g/m²40D 2L Gore-TexAround TownRegular435g / 15.3 oz70 cm / 27.5 inNoArc'teryx Cerium Hybrid (Women's) is equipped with 98 g/m² of Coreloft.
Arc'teryx Liatris (Women's)5/-15No dataNo dataNo dataNo dataNoNoNoParka850932,788Climashield80 g/m2 + 60 g/m270D 3L Gore-TexAround TownRegular890 g / 1 lb 15.4 oz75 cm / 29.5 inNoFill weight of Arc'teryx Liatris (Women's) is 93 grams. Its fill power is 850 cubic inches per ounce, which equals to a total of 2788 cubic inches of down fill volume. It's also reinforced with 80 g/m2 + 60 g/m2 of Climashield.
Arc'teryx Liatris Parka (Women's)2/-17No dataNo dataNo dataNo dataNoNoNoParka8501364,078Climashield80 g/m2 + 60 g/m270D 3L Gore-TexAround TownRegular1.093 kg / 2 lb 6.6 oz109 cm / 43 inNoFill weight of Arc'teryx Liatris Parka (Women's) is 136 grams. Its fill power is 850 cubic inches per ounce, which equals to a total of 4078 cubic inches of down fill volume. It's also reinforced with 80 g/m2 + 60 g/m2 of Climashield.
Arc'teryx Nuclei (aka FL) ( Men's - Women's)32/02/109/102/1010/10ReviewNoNoYesSyntheticN/AN/AN/ACoreloft Continuous65 g/m²Arato 10rAll RoundRegular325 g / 11.5 oz75 cm / 29.5 inNonucleiprotonbestsyntheticjackets2x dump-Arc'teryx Nuclei (aka FL) ( Men's - Women's) is equipped with 65 g/m² of Coreloft Continuous.
Arc'teryx Nuclei SV (Women's)5/-151/1010/102/108/10Warmest belay jacket. ReviewNoYesYesSyntheticN/AN/AN/ACoreloft Continuous190 g/m2 + 90 g/m2Arato 15All RoundRegular600 g / 1 lb 5.2 oz81 cm / 31.8 inNonucleiprotonbestsyntheticjackets2x dump1x chestArc'teryx Nuclei SV (Women's) is equipped with 190 g/m2 + 90 g/m2 of Coreloft Continuous.
Arc'teryx Patera (Women's)21/-6No dataNo dataNo dataNo dataReviewNoYesNoParka750671,773Coreloft60 + 80 g/m²2L Gore-TexAround TownTrim867 g / 1 lb 14.6 oz99 cm / 39 inNoFill weight of Arc'teryx Patera (Women's) is 67 grams. Its fill power is 750 cubic inches per ounce, which equals to a total of 1773 cubic inches of down fill volume. It's also reinforced with 60 + 80 g/m² of Coreloft.
Arc'teryx Patera Long (Women's)0/-18No dataNo dataNo dataNo dataWomen's warmest parka. NoYesNoParka7502045,397Coreloft60 + 80 g/m²2L Gore-TexAround TownRegular1.1 kg / 2 lb 6.8 oz117.5 cm / 46.25 inNoFill weight of Arc'teryx Patera Long (Women's) is 204 grams. Its fill power is 750 cubic inches per ounce, which equals to a total of 5397 cubic inches of down fill volume. It's also reinforced with 60 + 80 g/m² of Coreloft.
Arc'teryx Proton Lightweight (aka FL) (Men's - Women's)48/98/104/107/106/10Chilly summer mornings.ReviewNoNoNoSyntheticN/AN/AN/AOcta Loft94 g/m²Fortius Air 20ClimbingTrim343 g / 12.1 oz75 cm / 29.5 inNoatomprotonnucleiprotonbestsyntheticjackets-1x chestArc'teryx Proton Lightweight (aka FL) (Men's - Women's) is equipped with 94 g/m² of Octa Loft.
Arc'teryx Therme Parka (Men's)5/-15No dataNo dataNo dataNo dataReviewNoYesNoParka7501203,175Coreloft60 + 80 g/m²P75d PolyesterAround TownRegular991 g / 2 lb 3 oz85 cm / 33.5 inNoFill weight of Arc'teryx Therme Parka (Men's) is 120 grams. Its fill power is 750 cubic inches per ounce, which equals to a total of 3175 cubic inches of down fill volume. It's also reinforced with 60 + 80 g/m² of Coreloft.
Arc'teryx Therme SV (Men's)-11/-24No dataNo dataNo dataNo dataMen's warmest parka. ReviewNoYesNoParka7502115,582Coreloft60 g/m²2L Gore-TexAround TownRegular1.072 kg / 2 lb 5.8 oz96 cm / 37.75 inNoFill weight of Arc'teryx Therme SV (Men's) is 211 grams. Its fill power is 750 cubic inches per ounce, which equals to a total of 5582 cubic inches of down fill volume. It's also reinforced with 60 g/m² of Coreloft.
Arc'teryx Thorium ( Men's - Women's)12/-11No dataNo dataNo dataNo dataWarm down jacket.ReviewNoYesYesDown7501403,704Coreloft80 + 140 g/m²Arato 30All RoundRegular517 g / 1 lb 2.2 oz71.5 cm / 28.1 inNobestdownjacketsFill weight of Arc'teryx Thorium ( Men's - Women's) is 140 grams. Its fill power is 750 cubic inches per ounce, which equals to a total of 3704 cubic inches of down fill volume. It's also reinforced with 80 + 140 g/m² of Coreloft.
Arc'teryx Thorium Parka (Women's)-2/-19No dataNo dataNo dataNo dataReviewNoYesNoDown7502095,529Coreloft80 + 140 g/m²Arato 20Around TownRegular610 g / 1 lb 5.5 oz115.8 cm / 45.6 inNoFill weight of Arc'teryx Thorium Parka (Women's) is 209 grams. Its fill power is 750 cubic inches per ounce, which equals to a total of 5529 cubic inches of down fill volume. It's also reinforced with 80 + 140 g/m² of Coreloft.
Arc'teryx Thorium SV (Men's)3/-16No dataNo dataNo dataNo dataGore-Tex down jacket.NoYesYesDown7501694,471Coreloft80 + 140 g/m²Arato 30 & 2L Gore-Tex InfiniumAround TownRegular645 g / 1 lb 6.8 oz73 cm / 28.75 inNobestdownjacketsFill weight of Arc'teryx Thorium SV (Men's) is 169 grams. Its fill power is 750 cubic inches per ounce, which equals to a total of 4471 cubic inches of down fill volume. It's also reinforced with 80 + 140 g/m² of Coreloft.
Arc'teryx Thorium SV Parka (Men's)0/-18No dataNo dataNo dataNo dataNoYesNoDown7501955,159Coreloft80 + 140 g/m²Arato 30 & 2L Gore-Tex InfiniumAround TownRegular685 g / 1 lb 8.2 oz85 cm / 33.5 inNobestdownjacketsFill weight of Arc'teryx Thorium SV Parka (Men's) is 195 grams. Its fill power is 750 cubic inches per ounce, which equals to a total of 5159 cubic inches of down fill volume. It's also reinforced with 80 + 140 g/m² of Coreloft.
Black Diamond Access Down (Men's - Women's)7/-14No dataNo dataNo dataNo dataNoYesYesDown7001553,827N/AN/A30D ripstop nylonAll RoundRegular442 g / 15.6 oz76 cm / 29.75 inNoFill weight of Black Diamond Access Down (Men's - Women's) is 155 grams. Its fill power is 700 cubic inches per ounce, which equals to a total of 3827 cubic inches of down fill volume.
Feathered Friends Eos(Men's - Women's)8/-13No dataNo dataNo dataNo dataNoNoYesDown9001053,333N/AN/APertex QuantumAll RoundRegular306 g / 10.8 oz?NoFill weight of Feathered Friends Eos(Men's - Women's) is 105 grams. Its fill power is 900 cubic inches per ounce, which equals to a total of 3333 cubic inches of down fill volume.
Feathered Friends Khumbu (Men's)-17/-27No dataNo dataNo dataNo dataNoNoYesDown90037812,000Primaloft Gold200 gPretex Shield XTAll RoundRegular960 g / 2 lb 2 oz?NoFill weight of Feathered Friends Khumbu (Men's) is 378 grams. Its fill power is 900 cubic inches per ounce, which equals to a total of 12000 cubic inches of down fill volume. It's also reinforced with 200 g of Primaloft Gold.
Mountain Equipment Exo (Men's)-10/-23No dataNo dataNo dataNo dataNoYesYesDown8002657,478N/AN/ANylonAll RoundRegular770 g / 1 lb 11.2 oz79 cm / 31 inNoFill weight of Mountain Equipment Exo (Men's) is 265 grams. Its fill power is 800 cubic inches per ounce, which equals to a total of 7478 cubic inches of down fill volume.
Mountain Equipment K7 (Men's)-13/-25No dataNo dataNo dataNo dataNoYesYesDown8003008,466N/AN/A30D DriliteAll RoundRegular820 g / 1 lb 13 oz76 cm / 30 inNoFill weight of Mountain Equipment K7 (Men's) is 300 grams. Its fill power is 800 cubic inches per ounce, which equals to a total of 8466 cubic inches of down fill volume.
Mountain Hardwear GW/2 (Men's - Women's)28/-2No dataNo dataNo dataNo dataNoNoYesDown800852,399N/AN/A10D Ripstop NylonAll RoundTrim250 g / 8.8 oz70 cm / 27.5 inNoFill weight of Mountain Hardwear GW/2 (Men's - Women's) is 85 grams. Its fill power is 800 cubic inches per ounce, which equals to a total of 2399 cubic inches of down fill volume.
Outdoor Research Sup. Alp. (Men's - Women's)3/-16No dataNo dataNo dataNo dataNoYesNoDown8001825,136N/AN/A30D Pertex Quantum ProAll RoundRegular825 g / 1 lb 13.1 oz85 cm / 33.5 inNoFill weight of Outdoor Research Sup. Alp. (Men's - Women's) is 182 grams. Its fill power is 800 cubic inches per ounce, which equals to a total of 5136 cubic inches of down fill volume.
Patagonia AlpLight (Men's - Women's)36/2No dataNo dataNo dataNo dataNoNoYesDown8001002,822N/AN/A0.8 oz 10D polyesterAll RoundSlim270 g / 9.5 oz74 cm / 29 inNoFill weight of Patagonia AlpLight (Men's - Women's) is 100 grams. Its fill power is 800 cubic inches per ounce, which equals to a total of 2822 cubic inches of down fill volume.
Patagonia AlpLoft (Men's)-10/-23No dataNo dataNo dataNo dataNoYesYesDown8002958,325N/AN/APertex QuantomAll RoundRegular680 g / 1 lb 8 oz81 cm / 31.8 inNoFill weight of Patagonia AlpLoft (Men's) is 295 grams. Its fill power is 800 cubic inches per ounce, which equals to a total of 8325 cubic inches of down fill volume.
Patagonia DAS (Men's -