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Arc's multitasker.

Arc'teryx made the Atom LT Hooded Insulation Jacket versatile for year-round mountain adventures from climbing to skiing. Its Tinthan shell is light yet durable, and the DWR coating sheds rainfall to help keep you dry on hikes and backpacking trips. Breathable Polartec Power Stretch side panels make sure you can move around with complete freedom of motion, whether you're wearing it as a midlayer or an external shell. Synthetic Coreloft insulation retains its warmth in wet weather, and the adjustable StormHood slides over helmets with ease. Arc'teryx also added an adjustable hem, a zippered internal pocket, and two zippered hand pockets for your convenience.

  • Tinthan shell with DWR coating
  • Polartec Power Stretch side panels
  • Coreloft insulation
  • Trim fit, hip length
  • Helmet-compatible StormHood
  • Adjustable hem
  • Zippered internal and hand pockets

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Here's what others have to say...

Unanswered Question

My heigh is 5'5", should I go for the xs or small one? I also wanted to know how long is the jacket (is it hip length or like in the mid thigh)?

Unsure about what size I should get...I am 6'0 170lbs with a slim/athletic build. I want to be able to wear a fleece jacket underneath this, so I was thinking a large, but I am not sure...

I'm built similar to you (6'1" 175lbs) and sport a medium in this jacket and would not be able to fit a light 100wt fleece under this comfortably. You would probably be better suited with a large if heavy layering will be used. It's a tad slimmer than say a similar Patagonia sized jacket, but works great with a long sleeve shirt or thermal. I love this jacket for it's weight to warmth ratio you will not be disappointed...

I agree with Philip, go Large in the Atom LT if you want to layer a fleece underneath. I am 6'1" 185 lbs and have this jacket in Large so feel free to shoot me any additional questions directly.


Expert Gearhead


Hiking in Albania

Hiking in Albania

Kept me warm as we hiked along the Mediterranean Sea. Very durable despite its thin material and deceptively warm when doing any sort of activity.


Good, but re-work the drawstring!

  • Familiarity:I've used it several times
  • Fit:True to size
  • Height: 6'2"
    Weight: 200 lbs
    Size Purchased: Large

Brought this with me as a midlayer during a very rainy and cold Mt. Fuji trip. It fit well under my Large Patagonia Super Pluma Gore

I am a 6'2" 200lb man and opted for the large, which fits perfectly (exactly as seen on the dude in the stock photo)

Packability is decent when you stuff the coat into it's sleeve (it does not stuff into a pocket or a stuffsack). Obviously, down packs better, but it'll squeeze into a 10" by 5" oval without much trouble.

My only caveat is the drawstring that pokes into my right hip. It seems to be larger and bulkier than other drawstrings and would leave a bruise if bumped against a tree on the trail.

Good, but re-work the drawstring!

How well does the hood fit when not wearing a helmet?

Hey Matthew, I've never worn a helmet with mine and have had no issues with the hood. I do not own the newest version of the Atom LT, so my hood doesn't even have any adjustments. Considering my experience and how you can now adjust the hood, I'm confident you won't have any problems.

I have to disagree. Arcteryx needs major work on the adjustment system of the hood. When you cinch the hood, it looks like your head is the shape of a mushroom.


Really great jacket

  • Familiarity:I've put it through the wringer
  • Fit:True to size
  • Height: 6'
    Weight: 210 lbs
    Size Purchased: XL

I've had it for over a year now and can easily say it's my favorite jacket I've ever owned. It's on me every day whether going to work, camping, skiing (probably its best use), climbing. I hung it in the closet from June through August but now its back on me every day. My favorite part about this jacket is it feels like you're wearing nothing; it's so light and so easy to maneuver in it but still so warm... It's really a perfect jacket, especially if you run hot, you can get away with wearing this in pretty cold temps.

The Atom LT Taking In The North Rim

The Atom LT Taking In The North Rim

I bought my first Atom LT in Courmayeur while walking Tour du Mont Blanc. I loved it so much I bought another when I returned home.

Man, I'm getting one for IN the canyon next month!

I am trying to decide between the hood or no hood. Definitely plan to use it under my shell for skiing which is where the hood could be annoying. But for other things where I use it as an outer layer (belaying mostly and/or hiking) the hood may be nice. Is the hood annoying under a coat or is it not too bad?

Best Answer

I have the hooded version and use it as a midlayer under my shell for skiing, it doesn't bother me. I can tuck the hood into the shell hood and I don't even notice it. The hood is definitely worth having, especially on a cold night to keep your head and face warm.


Atom LT Hooded

  • Familiarity:I've put it through the wringer
  • Fit:True to size
  • Height: 5'6"
    Weight: 130 lbs
    Size Purchased: Small

Nice light weight insulated jacket that adds the right amount of warmth and protection. Use it with just a t-shirt on crisp New England fall days, throw it on under my shell on snowy cold ski days and could not be happier. Really seems to always have the Goldilocks balance, not too hot, not too cold, just right. Got it off SAC for a great deal, if something was to happen to it I would repurchase for full price though, it is that much of a go to.

Atom LT Hooded

Hi, I'm 181 cm / 73kg / 95 cm chest.

Would you recommend a Medium or a Small?

The chest measurement is the best to go off of when picking out jackets. The small will actually be a perfect fit for you if you want to wear the jacket the way it was intended to be worn which is athletic or slightly tighter for people climbing in it. If you want a much more relaxed fit then the medium is an option but, I feel that it would be way to big as the small chest measurement fits best for people at 97cm.

If you have anymore questions feel free to send me an email or call!

Bill Porreca



Was Skeptical-Now a Believer

  • Familiarity:I've put it through the wringer
  • Fit:True to size
  • Height: 5'8"
    Weight: 135 lbs
    Size Purchased: Small

Switching up a layering system is always an adventure. Got this jacket through my guiding outfit. Though its light on the insulation, this jacket really is fantastic for moderately cold days, or cold days and high output activities. The shell lightly repels moisture and the insulation doesnt seem to get bogged down when it gets a little wet. On ultra cold sub zero days I was able to wear this under a shell while ski touring without overheating. The jacket does a great job of dissipating heat. It packs into its own pocket and is super light. The hood is pretty amazing too. I had good luck fitting this under or over a helmet! Bonus! Pockets where you want them and just the right size. This jacket is function meets form. Couldn't be happier, but not my go to for lower output activities in the frigid cold.


Great cold/rainy day jacket

  • Familiarity:I've used it several times
  • Fit:True to size
  • Height: 5'11"
    Weight: 140 lbs
    Size Purchased: Medium

I recently purchased my jacket for use at school in michigan, and I love it.
I've worn it plenty of days in the wind and rain and it keeps both of it out very well. I recommend


A staple

  • Familiarity:I've put it through the wringer
  • Fit:True to size
  • Height: 6'0"
    Weight: 185 lbs
    Size Purchased: Medium

Couldn't agree more with what has been said about the Arc'Teryx Atom LT Hooded Insulated Jacket. This jacket is one of the pieces I use most when outdoors. It is light, warm and breathes well when exercising heats up your body. Synthetic insulation means it performs well when wet or when I get sweaty. My most common uses are for fall hikes or as a mid-layer in winter while snowboarding. This is a must-own jacket


Atom LT - genius

  • Familiarity:I've used it once or twice and have initial impressions
  • Fit:True to size
  • Height: 5'9"
    Weight: 150 lbs
    Size Purchased: Medium

As others have said, this is light, warm without being too hot and breathes well during exercise. So light on that it's easy to forget you're wearing it. Highly recommended.

Is there a jacket similar to this but more waterproof? Open to other brands. thanks!

With the DWR treatment this tends to shed rain about as well as a softshell. If you're looking for full waterproofing you'll probably want to look to a hardshell. If you're looking for light versatile layers I like the Patagonia Alpine Houdini as something to get on quick when the wet gets insistent.

I agree Alan! I think a jacket like this pairs perfectly with the Alpine Houdini, or Beta SL if you wanted to stay within the Arcteryx brand.

I am 5'10 and 175 with an athletic build - what size would you recommend? Thanks!

I'm 5'10" 185lbs and like my XL. I have large shoulders and find the XL allows full range of movement without binding or feeling loose/bulky. I typically layer it over a wool base layer.


One jacket to rule them all

  • Familiarity:I've put it through the wringer
  • Fit:True to size

If I could only have one jacket of any kind, this would be it. The Atom LT is incredibly warm for the weight and has a great performance fit, without being too tight. It packs down very small and will repel quite a bit of moisture, especially when properly treated with a new coat of Nikwax.

I wear this jacket...

-around the house over a tshirt

-to/from work

-inside my sleeping bag on cold nights

-under a bigger puffy on really cold days

-over a Patagonia R1 while ice climbing

-under a hardshell on windy, snowy ski days

Very minor negative: the hood is a great size for going over helmets but has no ability to cinch down. I think this is the right conscious decision by Arc'teryx: keep the weight down and keep the product more simple. However, if you want a jacket to use hooded + sans helmet + moving fast, you will likely be happier with something else. I often use a Patagonia Nano Air in that situation.

Photo: my friend Brett also drank the Atom LT we are in the ice park in Ouray, CO.

One jacket to rule them all