Arc’teryx Nuclei vs Proton: Temp ratings & more

Last updated: February 25, 2025

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Y'all know these are just my opinions... right?

As we head into fall/winter 2024, Arc'teryx is only offering women's Nuclei models. You can see all current Nuclei offerings here.

Below is our original look at the Nuclei vs. Proton Arc'teryx jackets.

Nuclei vs Proton: Overview

Arc'teryx Proton vs Nuclei: Nuclei SV

Me in Nuclei SV (Men's - Women's - read my review). 

I have all 5 items: 

  • Nuclei line: Niche products. Very warm at an instant, incredibly wind resistant and comfortable. But also not breathable at all and come with fragile outer fabrics. 
    • Nuclei (aka FL): Lesser warm Nuclei. 
    • Nuclei SV: Warmest Nuclei. 
  • Proton line: Versatile all round items. Very breathable and durable. But not that warm or wind resistant. 
    • Proton Lightweight (aka FL): Least warm Proton. 
    • Proton (aka LT): Mid warm Proton. 
    • Proton Heavyweight: Warmest Proton. 

I love them all. As long as you know what you're getting, none of them will disappoint. 

Find comparisons at arcteryx.com below. 

First thing to note is that Nuclei are more niche products.

They're belay jackets, meaning that they're meant to be put on when you stop moving (whatever high output activity you're performing).

They're meant to get them out of the bag and put them on quick to maintain your core temp. 

That's their main purpose. That's why they come with stuff sacks, offer terrible breathability, come with fragile face fabrics that cannot resist abrasion and are cut looser. 

Nuclei vs Proton

From top to bottom: Proton Lw (aka FL), Proton (aka LT), Proton Hw, Nuclei (aka FL) and Nuclei SV. 

They are however also spectacularly warm, incredibly wind resistant and extremely comfortable with a bunch of pockets. Its outstanding warmth to weight ratio is mind blowing. 

You feel the warmth inside a Nuclei at such an instant that it's insane. Unlike Proton, you don't even need to wait for the warmth to pick up. 

This is why I look at Nuclei as down jackets that can get wet. I use them casually as well, as long as my output is none to low. 

Luckily, the SV (the warmer) does come with a two way zipper. I primarily use this for comfort reasons when sitting down or driving (keeping only the upper half zipped).

Other use of two way zipper is for dumping excessive heat. Although it's not as effective as the Atom's side fleece panels it still helps a lot. 

Proton, on the other hand, are far more versatile. They're perfect for any high output activity, including climbing and heavy backpack use where lots of abrasion is expected.

Their cutting edge face fabrics are much more developed than Nuclei. They're breathable, come with a trimmer cut and shorter hem length. 

They're durable and can better resist against abrasion. You can wear them during high output activities or casually. 

But even the warmest Proton, Proton Hw, isn't nearly as warm as the warmest Nuclei, Nuclei SV. On top of that, you've got to wait for it to heat you. 

Although Proton and Nuclei are both water resistant, when it comes to wind resistance, the Nuclei has the edge by far. 

If you rarely get jackets, you might want to get one of the Protons. If warmth and weather resistance are your only concerns, and you don't care about breathability at all, get a Nuclei. 

If you're looking for maximizing the breathability, then you should stop reading here and visit Arc'teryx Proton vs Atom guide instead. I've got all the most recent Atoms, too (Hw (aka AR), base (aka LT) and SL (soon to be Lw)) and they're the most breathable line. 

Find comparisons at arcteryx.com below. 

Nuclei (aka FL) vs Proton Lw (aka FL) vs Proton (aka LT): 

  • Nuclei SV vs Proton Hw: 
  • Naming changes

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

    • Nuclei FL → Nuclei
    • Proton FL → Proton Lightweight (in short, Lw)
    • Proton LT → Proton
    • There's also a new arrival, Proton Heavyweight. 

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

    • Fit

    Canberk is 5'11" and 165 pounds, with an athletic build. Size Medium fits him perfectly across almost all brands and product lines. 

    • Arc'teryx's 2024 men's fit revision

    Here's what Arc'teryx says about its most recent fit revision

    Not all jackets come with the revised fit - only the ones with following statement: 

    Nuclei vs Proton: Warmth

    Check out the table below. 

    You'll see not one but two different insulation thicknesses for Nuclei SV. 

    • Two layers of Coreloft (180 gsm) takes place at the front, back, and upper arms. 
    • Single layer of Coreloft (90 gsm) takes place at underarms, lower arm, sides, and hood.
    • Temperature ratings of Arc'teryx jackets

    NameEst. Temp (F/C)ReviewPit venting?Two way zipper?Stuffs into itself?TypeFill Power (in3/oz)Fill Weight (g)Fill Volume (in3)Synthetic FillSynth. Fill WeightFace FabricActivityFitWeightLength (CB)
    Arc'teryx Alpha Parka (Men's - Women's)-15 / -26ReviewNoYesYesDown8502968,875Coreloft90 g/m²N30r 2L GoreTex InfiniumClimbingRegular805 g / 1 lb 12.4 oz86 cm / 34 in
    Arc'teryx Alpha Lightweight (Men's - Women's)5/-15NoYesYesDown8501173,508Coreloft Compact40 g/m²Hadron 2L Gore-Tex InfiniumClimbingRegular540 g / 1 lb 3 oz79.5 cm / 31.25 in
    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 in
    Arc'teryx Atom SV (Men's - Women's)18/-8ReviewYes, meshNoNoSyntheticN/AN/AN/ACoreloft Continuous120 g/m2 30D TyonoAll RoundRegular455 g / 1 lb 74 cm / 29.1 in
    Arc'teryx Atom SL (Lightweight) (Men's - Women's)52/11ReviewYes, meshNoNoSyntheticN/AN/AN/ACoreloft Compact40 g/m²20D TyonoAll RoundTrim270 g / 9.5 oz72 cm / 28.3 in
    Arc'teryx Beta Down Insulated (Men's - Women's)0/-18YesYesNoParka8501263,778Coreloft80 g/m²2L 40D Gore-TexAll RoundRegular760 g / 1 lb 10.8 oz79 cm / 31 in
    Arc'teryx Beta Insulated (Men's)21/-6ReviewYes, zipsYesNoParkaN/AN/AN/ACoreloft Continuous80 g/m²2L 40D Gore-TexAll RoundRegular680 g / 1 lb 8 oz78.5 cm / 31 in
    Arc'teryx Beta Insulated Coat (Women's)16/-9ReviewNoYesNoParkaN/AN/AN/ACoreloft 80 g/m² + 120 g/m²2L 40D Gore-TexAround TownRegular600 g / 1 lb 5.2 oz86 cm / 34 in
    Arc'teryx Cerium (aka LT) (Men's - Women's)26/-3ReviewNoNoYesDown8501133,388Coreloft80 + 100 g/m²Arato 15All RoundTrim335 g / 11.8 oz72 cm / 28.3 in
    Arc'teryx Cerium Hybrid (Women's)44/7NoNoYesDown850441,319Coreloft40 + 100 g/m²Arato 15 + Fortius Air 50All RoundTrim260 g / 9.2 oz70 cm / 27.5 in
    Arc'teryx Cerium SV (Men's / Women's)2/-17ReviewNoYesNoDown10001304,586Coreloft140 g/m²20D Pertex® Diamond FuseAll RoundRegular436g / 15.4 oz79 cm / 31 in
    Arc'teryx Coelle (Women's)14/-10NoYesNoParkaN/AN/AN/ACoreloft98 g/m²40D 2L Gore-TexAround TownRegular435g / 15.3 oz70 cm / 27.5 in
    Arc'teryx Liatris (Women's)5/-15NoNoNoParka850932,788Climashield80 g/m2 + 60 g/m270D 3L Gore-TexAround TownRegular890 g / 1 lb 15.4 oz75 cm / 29.5 in
    Arc'teryx Liatris Parka (Women's)2/-17NoNoNoParka8501364,078Climashield80 g/m2 + 60 g/m270D 3L Gore-TexAround TownRegular1.093 kg / 2 lb 6.6 oz109 cm / 43 in
    Arc'teryx Nuclei (aka FL) ( Men's - Women's)32/0ReviewNoNoYesSyntheticN/AN/AN/ACoreloft Continuous65 g/m²Arato 10rAll RoundRegular325 g / 11.5 oz75 cm / 29.5 in
    Arc'teryx Nuclei SV (Women's)5/-15ReviewNoYesYesSyntheticN/AN/AN/ACoreloft Continuous190 g/m2 + 90 g/m2Arato 15All RoundRegular600 g / 1 lb 5.2 oz81 cm / 31.8 in
    Arc'teryx Patera (Women's)21/-6ReviewNoYesNoParka750671,773Coreloft60 + 80 g/m²2L Gore-TexAround TownTrim867 g / 1 lb 14.6 oz99 cm / 39 in
    Arc'teryx Patera Long (Women's)0/-18NoYesNoParka7502045,397Coreloft60 + 80 g/m²2L Gore-TexAround TownRegular1.1 kg / 2 lb 6.8 oz117.5 cm / 46.25 in
    Arc'teryx Proton SL (Lightweight) (Men's - Women's)48/9ReviewNoNoNoSyntheticN/AN/AN/AOcta Loft94 g/m²Fortius Air 20ClimbingTrim343 g / 12.1 oz75 cm / 29.5 in
    Arc'teryx Therme Parka (Men's)5/-15ReviewNoYesNoParka7501203,175Coreloft60 + 80 g/m²P75d PolyesterAround TownRegular991 g / 2 lb 3 oz85 cm / 33.5 in
    Arc'teryx Therme SV (Men's)-11/-24ReviewNoYesNoParka7502115,582Coreloft60 g/m²2L Gore-TexAround TownRegular1.072 kg / 2 lb 5.8 oz96 cm / 37.75 in
    Arc'teryx Thorium ( Men's - Women's)12/-11ReviewNoYesYesDown7501403,704Coreloft80 + 140 g/m²Arato 30All RoundRegular517 g / 1 lb 2.2 oz71.5 cm / 28.1 in
    Arc'teryx Thorium Parka (Women's)-2/-19ReviewNoYesNoDown7502095,529Coreloft80 + 140 g/m²Arato 20Around TownRegular610 g / 1 lb 5.5 oz115.8 cm / 45.6 in
    Arc'teryx Thorium SV (Men's)3/-16NoYesYesDown7501694,471Coreloft80 + 140 g/m²Arato 30 & 2L Gore-Tex InfiniumAround TownRegular645 g / 1 lb 6.8 oz73 cm / 28.75 in
    Arc'teryx Thorium SV Parka (Men's)0/-18NoYesNoDown7501955,159Coreloft80 + 140 g/m²Arato 30 & 2L Gore-Tex InfiniumAround TownRegular685 g / 1 lb 8.2 oz85 cm / 33.5 in
    Black Diamond Access Down (Men's - Women's)25/-4NoNoYesDown8001123,161N/AN/A20D ripstop nylonAll RoundRegular323 g / 11.4 oz76 cm / 29.75 in
    Black Diamond Deploy Hoody (Men's - Women's)27/-3NoNoYesDown8001103,104N/AN/A10D ripstop nylonAll RoundRegular304 g / 10.7 oz
    Black Diamond Mission Down Parka (Men's - Women's)-5/-20NoYesNoDown8002527,111N/AN/A Nylon with Liquid Crystal Polymer RipstopAll RoundRegular616 g / 21.7 oz78 cm / 30.75 in
    Feathered Friends Eos(Men's - Women's)8/-13NoNoYesDown9001053,333N/AN/APertex QuantumAll RoundRegular306 g / 10.8 oz?
    Feathered Friends Khumbu (Men's)-17/-27NoNoYesDown90037812,000Primaloft Gold200 g/m²Pretex Shield XTAll RoundRegular960 g / 2 lb 2 oz?
    Feathered Friends Ellia (Women's)23/-5NoNoNoDown9001384,381N/AN/APertex® Endurance® LTAll RoundRegular368 g / 13 oz
    Feathered Friends Helios (Unisex)18/-8NoYesYesDown9001855,873N/AN/A20D Pertex® Quantum Pro®All RoundRegular426 g / 15 oz
    Feathered Friends Volant (Unisex)-13/-25NoYesNoDown9003119,873N/AN/A20d recycled Pertex® ShieldAll RoundRegular732 g / 1 lb 9.8 oz
    Patagonia AlpLoft (Men's)-10/-23NoYesYesDown8002958,325N/AN/APertex® QuantumAll RoundRegular680 g / 1 lb 8 oz81 cm / 31.8 in
    Patagonia DAS (Men's - Women's)10/-12ReviewNoYesYesSyntheticN/AN/AN/APrimaLoft Gold Insulation Eco133 + 40 g/m²Pertex® Quantum ProAll RoundRegular555 g / 1 lb 3.6 oz84 cm / 33 in
    Patagonia DAS Light(Men's)34/1ReviewNoYesYesSyntheticN/AN/AN/APlumaFill65 g10D Pertex Quantum ProAll RoundRegular320 g / 11.3 oz77 cm / 30.5 in
    Patagonia Down Sweater (Men's - Women's)23/-5ReviewNoNoYesDown8001504,233N/AN/A1.4 oz 20x30D polyesterAll RoundRegular428 g / 15.1 oz67 cm / 26.25 in
    Patagonia Downdrift (Men's - Women's)18/-8NoNoNoDown6002795,905N/AN/A4.2 oz polyesterAround TownRegular1.014 kg / 2 lb 3.8 oz?
    Patagonia Fitz Roy (Men's - Women's)14/-10NoNoYesDown8001283,612N/AN/A20D NylonAll RoundRegular632 g / 1 lb 6.3 oz74 cm / 29 in
    Patagonia Grade VII (Unisex)-17/-27NoYesDown90037211,810N/AN/A0.8 oz 10-denier Pertex® Quantum ProAll RoundRegular712 g / 1 lb 9oz87.5cm / 34.4 in
    Men's Hi-Loft Nano Puff® Hoody Men's - Women's23/-5ReviewNoYesNoSyntheticN/AN/AN/APrimaLoft® Silver200 + 170 g/m²1.4 oz 20D 100% recycled polyesterAll RoundRegular760 g / 1 lb 10.8 oz)
    Patagonia Isthmus (Men's)36/2NoNoNoParkaN/AN/AN/AThermoGreen60 g/m²4.2 oz polyesterAround TownRegular895 g / 1 lb 15.6 oz70 cm / 27.5 in
    Patagonia Jackson Glacier (Men's - Women's)12/-11ReviewNoYesNoDown7001413,482N/AN/A3.6 oz 50D polyesterAround TownRegular880 g / 1 lb 15 oz79 cm / 31 in
    Patagonia Jackson Glacier Parks ( Women's)7/-14NoNoNoParka7002185,383N/AN/A50D PolyesterAround TownRegular1.142 kg / 2 lb 8.3 oz?
    Patagonia Micro Puff (Men's - Women's)32/0ReviewNoNoYesSyntheticN/AN/AN/APlumaFill65 g/m²Pertex QuantumAll RoundRegular298 g / 10.5 oz75 cm / 29.5 in
    Patagonia Nano Air (Men's - Women's)35/2ReviewNoNoYesSyntheticN/AN/AN/AFullRange60 g/m²33D nylon ripstopAll RoundTrim401 g / 14.14 oz?
    Patagonia Nano Air Light Hybrid (Men's - Women's)40/5NoNoNoSyntheticN/AN/AN/AFullRange40 g/m²20D nylon ripstopAll RoundTrim335 g / 11.8 oz?
    Patagonia Nano Air Light Ultralight (Men's - Women's)45/7ReviewNoNoSyntheticN/AN/AN/AFullRange20 g/m²1.6-oz 30D shadow stretch polyester High OutputTrim249 g / 8.8 oz
    Patagonia Nano Puff (Men's - Women's)35/2ReviewNoNoYesSyntheticN/AN/AN/APrimaLoft Gold Insulation Eco60 g/m²22D PolyesterAll RoundRegular363 g / 12.8 oz71.5 cm / 28 in
    Patagonia Silent Down (Men's - Women's)26/-3ReviewNoNoNoDown7001092,691N/AN/A2.2 oz polyesterAround TownRegular585 g / 1 lb 4.7 oz74 cm / 29 in
    Patagonia Stormshadow (Men's)0/-18NoNoNoParka7002596,395N/AN/A75D PolyesterAround TownRegular1.182 kg / 2 lb 9.7 oz?
    Patagonia Stormshift Insulated (Men's - Women's)25/-4YesNoNoSyntheticN/AN/AN/AThermoGreen100 + 60 g/m²2L GORE-TEX ePESnowsportsRegular940 g / 2 lb 1 oz
    Patagonia Tres 3-in-1(Men's - Women's)8/-13ReviewNoNoNoParka7001182,914N/AN/A5.5 oz polyesterAround TownRegular1.307 kg / 2 lb 14.1 oz85 cm / 33.5 in
    Rab Electron Pro (Men's - Women's)5/-15NoYesYesDown8001805,079N/AN/A20D Pertex Quantum ProAll RoundRegular525 g / 1 lb 2.5 oz74 cm / 29 in
    Rab Infinity Windstopper Down (Men's)1/-17NoYesYesDown8001945,475N/AN/A30D GORE-TEX WindstopperAll RoundRegular657 g / l lb 7 oz77 cm / 30.3 in
    Rab Microlight Alpine (Men's - Women's)23/-5NoNoYesDown7001533,778N/AN/A30D Pertex QuantumAll RoundRegular466 g / 1 lb 0.5 oz72 cm / 28.5 in
    Rab Mythic G (Men's - Women's)15/-9NoNoNoDown10001274,480N/AN/A7D Atmosâ„¢ nylon w/ reflective lining.All RoundRegular277 g / 9.8 oz72 cm / 28.5 in
    Rab Mythic Ultra (Men's)-5/-20NoYesNoDown9002407,619N/AN/A10D Recycled Pertex® QuantumClimbingRegular537 g / 1 lb 3 oz76.5 cm / 30.1 in
    Rab Neutrino Pro (Men's - Women's)-2/-19NoYesYesDown8002125,982N/AN/A20D Pertex Quantum ProAll RoundRegular585 g / 1 lb 8.6 oz77 cm / 30.3 in
    REI Co-op 650 (Men's - Women's)30/-1NoNoNoDown650992,270N/AN/ARecycled ripstop nylonAll RoundRegular312 g / 11 oz72 cm / 28.5 in
    REI Magma 850 (Men's - Women's)26/-3NoNoYesDown8501113,328N/AN/ARecycled ripstop nylonAll RoundRegular312 g / 11 oz74 cm / 29.25 in
    Stio Hometown Down (Men's - Women's)12/-11ReviewNoNoNoDown8001985,587N/AN/A20D HTDâ„¢ 100% Recycled NylonAll RoundRegular581 g / 1 lb 4.5 oz
    Stio Pinion Hooded (Men's - Women's)26/-3NoNoDown8001253,527N/AN/A20D Pertex® Quantum®All RoundRegular312 g / 11 oz70 cm / 27.5 in
    Stio Shot 7 Insulated Shell (Men's - Women's)15/-9YesYesNoDown8001052,963N/AN/A75D GORE-TEX® 2L 170g ePESnowsportsRegular1.049kg / 2 lb 5 oz77 cm / 30.5 in
    Stio Colter (Men's - Women's)15/-9YesNoNoDown6502064,723N/AN/A50D GORE-TEX WINDSTOPPER® 2LAll RoundRegular850 g / 1 lb 14 oz72 cm / 28.5 in
     

    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.PackabilityReviewStuffs into itself?Face FabricActivityFitWeight
    Arc'teryx Alpha Parka (Men's - Women's)-15 / -26No dataNo dataNo dataNo dataReviewYesN30r 2L GoreTex InfiniumClimbingRegular805 g / 1 lb 12.4 ozNo
    Arc'teryx Alpha Lightweight (Men's - Women's)5/-15No dataNo dataNo dataNo dataYesHadron 2L Gore-Tex InfiniumClimbingRegular540 g / 1 lb 3 ozNo
    Arc'teryx Atom (aka LT) ( Men's - Women's)43/69/106/107/105/10ReviewNo20D TyonoAll RoundTrim375 g / 13.2 ozNo
    Arc'teryx Atom SV (Men's - Women's)18/-85/108/108/103/10ReviewNo30D TyonoAll RoundRegular455 g / 1 lb No
    Arc'teryx Atom SL (Lightweight) (Men's - Women's)52/1110/102/107/106/10ReviewNo20D TyonoAll RoundTrim270 g / 9.5 ozNo
    Arc'teryx Beta Down Insulated (Men's - Women's)0/-18No dataNo dataNo dataNo dataNo2L 40D Gore-TexAll RoundRegular760 g / 1 lb 10.8 ozNo
    Arc'teryx Beta Insulated (Men's)21/-6No dataNo dataNo dataNo dataReviewNo2L 40D Gore-TexAll RoundRegular680 g / 1 lb 8 ozNo
    Arc'teryx Beta Insulated Coat (Women's)16/-9No dataNo dataNo dataTestingReviewNo2L 40D Gore-TexAround TownRegular600 g / 1 lb 5.2 ozNo
    Arc'teryx Cerium (aka LT) (Men's - Women's)26/-3No dataNo dataNo dataNo dataReviewYesArato 15All RoundTrim335 g / 11.8 ozNo
    Arc'teryx Cerium Hybrid (Women's)44/7No dataNo dataNo dataNo dataYesArato 15 + Fortius Air 50All RoundTrim260 g / 9.2 ozNo
    Arc'teryx Cerium SV (Men's / Women's)2/-17No data4/107/10No dataReviewNo20D Pertex® Diamond FuseAll RoundRegular436g / 15.4 ozno
    Arc'teryx Coelle (Women's)14/-10No dataNo dataNo dataNo dataNo40D 2L Gore-TexAround TownRegular435g / 15.3 ozNo
    Arc'teryx Liatris (Women's)5/-15No dataNo dataNo dataNo dataNo70D 3L Gore-TexAround TownRegular890 g / 1 lb 15.4 ozNo
    Arc'teryx Liatris Parka (Women's)2/-17No dataNo dataNo dataNo dataNo70D 3L Gore-TexAround TownRegular1.093 kg / 2 lb 6.6 ozNo
    Arc'teryx Nuclei (aka FL) ( Men's - Women's)32/02/109/102/1010/10ReviewYesArato 10rAll RoundRegular325 g / 11.5 ozNo
    Arc'teryx Nuclei SV (Women's)5/-151/1010/102/108/10ReviewYesArato 15All RoundRegular600 g / 1 lb 5.2 ozNo
    Arc'teryx Patera (Women's)21/-6No dataNo dataNo dataNo dataReviewNo2L Gore-TexAround TownTrim867 g / 1 lb 14.6 ozNo
    Arc'teryx Patera Long (Women's)0/-18No dataNo dataNo dataNo dataNo2L Gore-TexAround TownRegular1.1 kg / 2 lb 6.8 ozNo
    Arc'teryx Proton SL (Lightweight) (Men's - Women's)48/98/104/107/106/10ReviewNoFortius Air 20ClimbingTrim343 g / 12.1 ozNo
    Arc'teryx Therme Parka (Men's)5/-15No dataNo dataNo dataNo dataReviewNoP75d PolyesterAround TownRegular991 g / 2 lb 3 ozNo
    Arc'teryx Therme SV (Men's)-11/-24No dataNo dataNo dataNo dataReviewNo2L Gore-TexAround TownRegular1.072 kg / 2 lb 5.8 ozNo
    Arc'teryx Thorium ( Men's - Women's)12/-11No dataNo dataNo dataNo dataReviewYesArato 30All RoundRegular517 g / 1 lb 2.2 ozNo
    Arc'teryx Thorium Parka (Women's)-2/-19No dataNo dataNo dataNo dataReviewNoArato 20Around TownRegular610 g / 1 lb 5.5 ozNo
    Arc'teryx Thorium SV (Men's)3/-16No dataNo dataNo dataNo dataYesArato 30 & 2L Gore-Tex InfiniumAround TownRegular645 g / 1 lb 6.8 ozNo
    Arc'teryx Thorium SV Parka (Men's)0/-18No dataNo dataNo dataNo dataNoArato 30 & 2L Gore-Tex InfiniumAround TownRegular685 g / 1 lb 8.2 ozNo
    Black Diamond Access Down (Men's - Women's)25/-4No data6/10No dataNo dataYes20D ripstop nylonAll RoundRegular323 g / 11.4 ozNo
    Black Diamond Deploy Hoody (Men's - Women's)27/-3No data6/10No data8/10Yes10D ripstop nylonAll RoundRegular304 g / 10.7 oz
    Black Diamond Mission Down Parka (Men's - Women's)-5/-20No dataNo dataNo dataNo dataNo Nylon with Liquid Crystal Polymer RipstopAll RoundRegular616 g / 21.7 oz
    Feathered Friends Eos(Men's - Women's)8/-13No dataNo dataNo dataNo dataYesPertex QuantumAll RoundRegular306 g / 10.8 ozNo
    Feathered Friends Khumbu (Men's)-17/-27No dataNo dataNo dataNo dataYesPretex Shield XTAll RoundRegular960 g / 2 lb 2 ozNo
    Feathered Friends Ellia (Women's)23/-5No dataNo dataNo dataNo dataNoPertex® Endurance® LTAll RoundRegular368 g / 13 oz
    Feathered Friends Helios (Unisex)18/-8No dataNo dataNo dataNo dataYes20D Pertex® Quantum Pro®All RoundRegular426 g / 15 oz
    Feathered Friends Volant (Unisex)-13/-25No dataNo dataNo dataNo dataNo20d recycled Pertex® ShieldAll RoundRegular732 g / 1 lb 9.8 oz
    Patagonia AlpLoft (Men's)-10/-23No dataNo dataNo dataNo dataYesPertex® QuantumAll RoundRegular680 g / 1 lb 8 ozNo
    Patagonia DAS (Men's - Women's)10/-121/109/103/106/10ReviewYesPertex® Quantum ProAll RoundRegular555 g / 1 lb 3.6 ozNo
    Patagonia DAS Light(Men's)34/12/108/102/109/10ReviewYes10D Pertex Quantum ProAll RoundRegular320 g / 11.3 ozNo
    Patagonia Down Sweater (Men's - Women's)23/-5No data4/106/107/10ReviewYes1.4 oz 20x30D polyesterAll RoundRegular428 g / 15.1 ozNo
    Patagonia Downdrift (Men's - Women's)18/-8No dataNo dataNo dataNo dataNo4.2 oz polyesterAround TownRegular1.014 kg / 2 lb 3.8 ozNo
    Patagonia Fitz Roy (Men's - Women's)14/-10No dataNo dataNo dataNo dataYes20D NylonAll RoundRegular632 g / 1 lb 6.3 ozNo
    Patagonia Grade VII (Unisex)-17/-274/105/104/106/100.8 oz 10-denier Pertex® Quantum ProAll RoundRegular712 g / 1 lb 9oz
    Men's Hi-Loft Nano Puff® Hoody Men's - Women's23/-54/106/107/103/10ReviewNo1.4 oz 20D 100% recycled polyesterAll RoundRegular760 g / 1 lb 10.8 oz)
    Patagonia Isthmus (Men's)36/2No dataNo dataNo dataNo dataNo4.2 oz polyesterAround TownRegular895 g / 1 lb 15.6 ozNo
    Patagonia Jackson Glacier (Men's - Women's)12/-11No dataNo dataNo dataNo dataReviewNo3.6 oz 50D polyesterAround TownRegular880 g / 1 lb 15 ozNo
    Patagonia Jackson Glacier Parks ( Women's)7/-14No dataNo dataNo dataNo dataNo50D PolyesterAround TownRegular1.142 kg / 2 lb 8.3 ozNo
    Patagonia Micro Puff (Men's - Women's)32/05/106/105/108/10ReviewYesPertex QuantumAll RoundRegular298 g / 10.5 ozNo
    Patagonia Nano Air (Men's - Women's)35/27/105/105/108/10ReviewYes33D nylon ripstopAll RoundTrim401 g / 14.14 ozNo
    Patagonia Nano Air Light Hybrid (Men's - Women's)40/5No dataNo dataNo dataNo dataNo20D nylon ripstopAll RoundTrim335 g / 11.8 ozNo
    Patagonia Nano Air Light Ultralight (Men's - Women's)45/79/105/10No dataNo dataReview1.6-oz 30D shadow stretch polyester High OutputTrim249 g / 8.8 oz
    Patagonia Nano Puff (Men's - Women's)35/24/106/106/108/10ReviewYes22D PolyesterAll RoundRegular363 g / 12.8 ozNo
    Patagonia Silent Down (Men's - Women's)26/-3No dataNo dataNo dataNo dataReviewNo2.2 oz polyesterAround TownRegular585 g / 1 lb 4.7 ozNo
    Patagonia Stormshadow (Men's)0/-18No dataNo dataNo dataNo dataNo75D PolyesterAround TownRegular1.182 kg / 2 lb 9.7 ozNo
    Patagonia Stormshift Insulated (Men's - Women's)25/-4No data8/10No dataNo dataNo2L GORE-TEX ePESnowsportsRegular940 g / 2 lb 1 oz
    Patagonia Tres 3-in-1(Men's - Women's)8/-13No dataNo dataNo dataNo dataReviewNo5.5 oz polyesterAround TownRegular1.307 kg / 2 lb 14.1 ozNo
    Rab Electron Pro (Men's - Women's)5/-15No dataNo dataNo dataNo dataYes20D Pertex Quantum ProAll RoundRegular525 g / 1 lb 2.5 ozNo
    Rab Infinity Windstopper Down (Men's)1/-17No data7/10No dataNo dataYes30D GORE-TEX WindstopperAll RoundRegular657 g / l lb 7 oz
    Rab Microlight Alpine (Men's - Women's)23/-5No dataNo dataNo dataNo dataYes30D Pertex QuantumAll RoundRegular466 g / 1 lb 0.5 ozNo
    Rab Mythic G (Men's - Women's)15/-9No dataNo dataNo data8/10No7D Atmosâ„¢ nylon w/ reflective lining.All RoundRegular277 g / 9.8 oz
    Rab Mythic Ultra (Men's)-5/-20No dataNo dataNo dataNo dataNo10D Recycled Pertex® QuantumClimbingRegular537 g / 1 lb 3 oz
    Rab Neutrino Pro (Men's - Women's)-2/-19No dataNo dataNo dataNo dataYes20D Pertex Quantum ProAll RoundRegular585 g / 1 lb 8.6 ozNo
    REI Co-op 650 (Men's - Women's)30/-1No dataNo dataNo dataNo dataNoRecycled ripstop nylonAll RoundRegular312 g / 11 oz
    REI Magma 850 (Men's - Women's)26/-3No dataNo dataNo dataNo dataYesRecycled ripstop nylonAll RoundRegular312 g / 11 ozNo
    Stio Hometown Down (Men's - Women's)12/-11No dataNo dataNo dataNo dataReviewNo20D HTDâ„¢ 100% Recycled NylonAll RoundRegular581 g / 1 lb 4.5 oz
    Stio Pinion Hooded (Men's - Women's)26/-3No dataNo dataNo dataNo data20D Pertex® Quantum®All RoundRegular312 g / 11 oz
    Stio Shot 7 Insulated Shell (Men's - Women's)15/-96/108/10No dataNo dataNo75D GORE-TEX® 2L 170g ePESnowsportsRegular1.049kg / 2 lb 5 oz
    Stio Colter (Men's - Women's)15/-95/10No dataNo dataNo dataNo50D GORE-TEX WINDSTOPPER® 2LAll RoundRegular850 g / 1 lb 14 oz
     

    Performance data axis of synthetic jackets (this table) and shell jackets (table below) are different. Don't compare them. 

    • Performance ratings of Arc'teryx shells

    NameActivityTemp (F/C)BreathabilityWeather Res.DurabilityBottom lineReviewPit zips?Two way zipper?Stuffs into itself?Face FabricFitWeightLength
    Alpha (aka AR) (Men's - Women's)ClimbingN/A8/109/108/104/10Go-to climbing harshell. ReviewYesNoNoN40d & N80d Most Rugged 3L Gore-Tex ProRegular430 g / 15.2 oz79.5 cm / 31.25 inNo
    Alpha SV (Men's - Women's)ClimbingN/A8/1010/1010/103/10Strongest climbing hardshell. ReviewYesNoNoN100d Most Rugged 3L Gore-Tex ProRegular510 g / 1 lb 2 oz78 cm / 30.75 inNo
    Beta (Men's - Women's)All RoundN/A6/107/107/108/10Streamlined all-doer shell.ReviewNoNoNoN30p-X 3L Gore-TexTrim300 g / 10.6 oz76 cm / 30 inNo
    Beta AR (Men's - Women's)All RoundN/A8/109/109/104/10Go-to all-round harshell. ReviewYesNoNoN40d & N80d Most Rugged 3L Gore-Tex ProRegular460 g / 1 lb 76 cm / 30 inNo
    Beta AR StormHood (Men's - Women's)All RoundN/A8/109/109/104/10ReviewYesNoNoN40d & N80d Most Rugged 3L Gore-Tex ProRegular460 g / 1 lb 76 cm / 30 inNo
    Beta Coat (Women's)All RoundN/A6/105/10No data5/10NoYesNo3L Gore-TexRegular320 g / 11.3 oz88 cm / 34.5 inNo
    Beta Down Insulated (Men's)All Round0/-189/107/108/10No dataYesYesNo2L 40D Gore-TexRegular760 g / 1 lb 10.8 oz79 cm / 31 inNo
    Beta Insulated (Men's - Women's)All Round21/-69/107/108/10No dataGo-to hybrid jacket.ReviewYesYesNoN40d 2L Gore-TexRegular680 g / 1 lb 8 oz78.5 cm / 31 inNo
    Beta Insulated Coat (Women's)All Round16/-97/10No dataNo dataNo dataNoYesNoN40d 2L Gore-TexRegular600 g / 1 lb 5.2 oz86 cm / 34 inNo
    Beta Lightweight (Men's - Women's)All RoundN/A8/107/107/106/10ReviewYesNoNoN40p 3L Gore-TexFitted380 g / 13.4 oz75 cm / 29.5 inNo
    Beta LT (Men's - Women's)All RoundN/A7/107/108/106/10ReviewYesNoNoN40d 3L Gore-TexFitted395 g / 13.9 oz76 cm / 30 inNo
    Gamma (aka LT) (Men's - Women's)All RoundN/A7/103/107/103/10Go-to softshell.ReviewNoNoNoWee Burly Double WeaveRegular545 g / 1 lb 3.2 oz76 cm / 30 inNo
    Gamma MX (Men's)All RoundN/A6/104/108/103/10Strongest softshell.ReviewNoNoNoFortius 2.0Regular555 g / 1 lb 3.6 oz74 cm / 29.1 inNo
    Norvan Shell (Men's)RunningN/ANo dataNo dataNo dataNo dataNoNoNo13D 3L Gore-TexTrim190 g / 6.7 oz73 cm / 28.75 inNo
    Rush (Women's)SkiingN/A8/109/109/103/10Go-to ski jacket. ReviewYesNoNoN80p-X & N100p-X 3L Most Rugged Gore-Tex ProRegular590 g / 1 lb 4.8 oz79.5 cm / 31.25 inNo
    Rush Insulated (Women's)Skiing16/-93/105/105/109/10ReviewNoNoYesHadron 2L Gore-Tex InfiniumRegular515 g / 1 lb 2.2 oz79 cm / 31 inYes
    Sabre (Men's)SkiingN/A8/108/107/102/10ReviewYesNoNoN80p-X 3L Gore-TexRegular705 g / 1 lb 8.9 oz79 cm / 31 inNo
    Sentinel (Women's)SkiingN/A8/107/107/102/10Go-to ski jacket. ReviewYesNoNoN70p 3L Gore-TexRegular640 g / 1 lb 6.6 oz73.7 cm / 29 inNo
    Sentinel Insulated (Women's)Skiing21/-68/10No dataNo dataNo dataReviewYesNoNoN80p 2L Gore-TexRegular600 g / 1 lb 5.2 oz79.8 cm / 31.5 inNo
    Sentinel Relaxed (Women's)SkiingN/ANo dataNo dataNo dataNo dataYesNoNoN80p 3L Gore-TexRegular655 g / 1 lb 7.1 oz?No
    Sidewinder (Women's)SkiingN/A8/108/107/102/10YesNoNoN80p 3L Gore-TexRegular570 g / 1 lb 4.1 oz?No
    Solano (Men's - Women's)Around TownN/ANo dataNo dataNo dataNo dataReviewNoNoNoGore-Tex InfiniumRelaxed355 g / 12.5 oz72 cm / 28.3 inNo
    Squamish (Men's - Women's)RunningN/A5/104/107/109/10Go-to running jacket.ReviewNoNoYes30D TyonoTrim140 g / 4.9 oz77.5 cm / 30.5 inNo
    Theriss Down (Women's)SkiingNo data7/106/107/102/10ReviewYesNoNoN80p 2L Gore-TexRegular709 g / 1 lb 9 oz63 cm / 24.8 inNo
    Alpha FL (Men's - Women's)ClimbingN/A7/10No dataNo data10/10NoNoYesHadron 3L Gore-TexTrim209 g / 7.4 oz76.5 cm / 30 inYes
    Alpha IS (Men's)Climbing23/-57/105/10No data8/10NoYesYesN40p-X 2L Gore-TexRegular610 g / 1 lb 5.5 oz78 cm / 30.75 inYes
    Alpha SL (Men's - Women's)ClimbingN/A5/107/10No data9/10NoNoYesN40p 3L Gore-TexTrim326 g / 11.5 oz77.5 cm / 30.5 inYes
    Beta SV (Men's - Women's)All RoundN/A8/1010/1010/103/10Strongest all-round harshell. ReviewYesNoNoN80p-X Most Rugged 3L Gore-Tex ProRegular495 g / 1 lb 1.5 oz79 cm / 31 inYes
    Gamma SL (aka lightweight) (Men's - Women's)All RoundN/A7/102/106/105/10ReviewNoNoNoFortius 1.0Trim310 g / 10.9 oz74 cm / 29.1 inYes
    Incendia (Women's)SkiingN/A8/109/109/103/10ReviewYesNoNoNP100d 3L Gore-TexTrim610 g / 1 lb 5.5 oz79 cm / 31 inYes
    Incendo (Men's)RunningN/A7/104/105/1010/10ReviewNoNoYesLuminTrim125 g / 4.4 oz?Yes
    Incendo Airshell (Men'sRunningN/ANo dataNo dataNo dataNo dataNoNoYes?Trim105 g / 3.7 oz?Yes
    Incendo SL (Men's)RunningN/A7/104/104/1010/10ReviewNoNoYesPermair 20 & CanimTrim80 g / 2.8 oz73 cm / 28.75 inYes
    Macai (Men's)Skiing5/-157/107/106/101/10ReviewYesNoNoN40p-X 3L Gore-TexRegular990 g / 2 lb 2.9 oz75 cm / 29.5 inYes
    Macai Lightweight (aka LT) (Men's)Skiing8/-137/107/106/102/10ReviewYesNoNoN40p-X 3L Gore-TexRegular855 g / 1 lb 14.2 oz?Yes
    Macai Shell (Men's)SkiingN/ANo dataNo dataNo dataNo dataReviewYesNoNoN80p-X 3L Gore-TexRegular775 g / 1 lb 11.3 oz?Yes
    Micon (Men's)SkiingN/ANo dataNo dataNo dataNo dataYesNoNoN80p 3L Gore-TexRegular685 g / 1 lb 8.2 oz83 cm / 32.5 inYes
    Micon HeatherSkiingN/ANo dataNo dataNo dataNo dataYesNoNoNP100-d 3L Gore-TexRegular685 g / 1 lb 8.2 oz83 cm / 32.5 inYes
    Nodin (Men's - Women's)RunningN/A8/105/105/1010/10NoNoYes20D TyonoTrim130 g / 4.6 oz75 cm / 29.5 inYes
    Norvan LT (Men's - Women's)RunningN/A5/105/108/106/10NoNoNoN13p 3L Gore-TexTrim190 g / 6.7 oz?Yes
    Norvan SL (Men's - Women's)RunningN/A7/106/108/108/10ReviewNoNoYesGore-Tex InfiniumTrim120 g / 4.2 oz77 cm / 30.4 inYes
    Norvan SL Ins. (Women's)Running39/4No dataNo dataNo dataNo dataNoNoYesGore-Tex ShakeDryTrim270 g / 9.5 oz71.5 cm / 28.1 inYes
    Norvan Windshell (Men'sRunningN/ANo dataNo dataNo dataNo dataNoNoYesPermeair 20Trim90 g / 3.2 oz73 cm / 28.75 inYes
    Procline (Men's)SkiingN/ANo dataNo dataNo dataNo dataYesNoNoN70p Gore-Tex InfiniumTrim720 g / 1 lb 9.4 oz76 cm / 30 inYes
    Ravenna (Women's)SkiingN/A8/107/108/103/10ReviewYesNoNoN70s-4 3L Gore-TexTrim725 g / 1 lb 9.6 oz69.5 cm / 27.4 inYes
    Ravenna LT (Women's)SkiingN/A6/106/106/105/10ReviewYesNoNoN70p 3L Gore-TexTrim540 g / 1 lb 3 oz69 cm / 27.2 inYes
    Sabre AR (Men's)SkiingN/A7/108/107/107/10ReviewYesNoNoN70p 3L Gore-TexRegular700 g / 1 lb 8.7 oz79 cm / 31 inYes
    Sabre Insulated (See related products)SkiingNo data7/10No data6/10No dataReviewYesNoNoN80p 2L Gore-TexRegular815 g / 1 lb 12.7 oz76 cm / 30 inYes
    Sabre LT (Men's)SkiingN/A7/108/107/108/10ReviewYesNoNoN80p 3L Gore-TexRegular660 g / 1 lb 7.3 oz83 cm / 32.5 inYes
    Sabre SV (Men's)SkiingN/A10/1010/1010/101/10Strongest ski jacket.ReviewYesYesNoN100d Most Rugged 3L Gore-Tex ProRegular595 g / 1 lb 5 oz85 cm / 33.5 inNo
    Sentinel AR (Women's)SkiingN/A7/108/107/107/10ReviewYesNoNoN70p 3L Gore-TexRegular590 g / 1 lb 4.8 oz72.5 cm / 28.5 inYes
    Sentinel LT (Women's)SkiingN/A7/108/107/108/10ReviewYesNoNoN80p 3L Gore-TexRegular565 g / 1 lb 3.9 oz73.5 cm / 29 inYes
    Shashka Stretch (Women's)SkiingN/ANo dataNo dataNo dataNo dataYesNoNoN70p Gore-Tex InfiniumTrim670 g / 1 lb 7.6 oz71 cm / 28 inYes
    Trino SL (Men's)RunningN/A8/105/107/106/10ReviewNoNoNoGore-Tex InfiniumTrim340 g / 12 oz74 cm / 29.1 inYes
    Trino SL Anorak (Women's)RunningN/A8/107/108/107/10ReviewNoNoNoGore-Tex InfiniumTrim290 g / 10.2 oz65 cm / 25.5 inYes
    Venda Anorak (Women's)Around TownN/ANo dataNo dataNo dataNo dataNoNoNoGore-TexRelaxed255 g / 9 oz75.5 cm / 29.7 inYes
    Zeta AR (Men's)HikingN/A7/108/107/104/10YesNoNo3L Gore-TexRegular425 g / 15 oz80 cm / 31.5 inYes
    Zeta FL (Men's - Women's)HikingN/A4/106/104/106/10NoNoNoN20r 2L Gore-TexTrim221 g / 7.8 oz76 cm / 30 inYes
    Zeta LT (Men's - Women's)HikingN/A5/107/108/105/10NoNoNoN40P-X 3L Gore-TexTrim335 g / 11.8 oz78 cm / 30.75 inYes
    Zeta SL (Men's - Women's)HikingN/A3/105/104/105/10ReviewNoNoNo2L Gore-TexTrim310 g / 10.9 oz77.8 cm / 30.6 inYes
     

    Performance data axis of synthetic jackets (table above) and shell jackets (this table) are different. Don't compare them. 

    Nuclei vs Proton: Packability 

    Unfortunately, none of the Protons offer packability. 

    Both Nuclei come with attached stuff sacks. 

    Both Nuclei come with an attached stuff sack. They take place inside the dump pocket when not in use. Image belongs to Nuclei SV. 

    Nuclei SV is packed larger. 

    • Packed sizes: 
      • Nuclei SV: 11 in (or 28 cm) length x 7.1 in (or 18 cm) diameter
      • Nuclei (aka FL): 10.2 in (or 26 cm) length x 5.1 in (or 13 cm) diameter

    See images below. 

    Nuclei vs Proton: Nuclei packed sizes
    Nuclei vs Proton: Nuclei packed sizes (front)

    Both offer a reinforced loop when packed (see packed sizes image). 

    Nuclei vs Proton: Pockets 

    Let's start with Protons. 

    • Proton Hw: 
      • Hand warmers: 9.1 in (or 23 cm) x 8.3 in (or 21 cm) 
      • Internal dump pockets: 7.9 in (or 20 cm) x 8.3 in (or 21 cm)
      • External chest pockets: See image.
    • Proton:
      • Hand warmers: 9.4 in (or 24 cm) height x 7.5 in (or 19 cm) width
      • External chest pocket: See image. 
    • Proton Lw:
      • Hand warmers: 10.26 inches (or 26 cm) height x 7.1 inches (18 cm) width
      • External chest pocket: See image. 

    Proton and Proton Lw offers 1, Proton Hw offers 2 chest pockets. 

    Nuclei vs Proton: Protons pockets
    • Nuclei SV:
      • Hand warmers: 11.8 in (or 30 cm) x 7.5 in (or 19 cm)
      • External zippered chest pocket: 11 in (or 28 cm) x 8.3 in (or 21 cm)
      • Dump pockets: 7.5 in (or 19 cm) x 10.2 in (or 26 cm)
    • Nuclei (aka FL): 
      • Hand warmers: 7.5 in (or 19 cm) x 7.9 in (or 20 cm)
      • Dump pockets: 7.5 in (or 19 cm) x 8.7 in (or 22 cm)

    Nuclei vs Proton: Cuffs

    Nuclei FL is different than the other four. One is not better than the other, it's simply up to you. 

    Nuclei vs Proton: Nuclei cuffs

    Left: Nuclei (aka FL). Right: Nuclei SV. 

    Nuclei vs Proton: Proton Cuffs

    Poll results: Best colorways of Proton Series

    Upvote your favorites.

    Proton Lightweight Hoody Men's

    Proton Lightweight Hoody Women's

    Proton Hoody Women's

    Find comparisons at arcteryx.com below. 

    Nuclei (aka FL) vs Proton Lw (aka FL) vs Proton (aka LT): 

  • Nuclei SV vs Proton Hw: 
  • Best colors

    Poll results: Best colorways of Proton Series

    Upvote your favorites.

    Proton Lightweight Hoody Men's

    Proton Lightweight Hoody Women's

    Proton Hoody Women's


    Check out our other content on jackets:

    Guide: Insulated & Shell Jackets

    Start here:

    Also see:

    About the Author Canberk K.


    Hey, what's up? Canberk here. Arc'teryx addict, gym rat, and Tame Impala fan.