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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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Arc'teryx Atom LT Hooded Insulated Jacket - Men's

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5 5

The piece I plan my other layers around

  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Height: 5' 10"
    Weight: 185 lbs
    Size Purchased: XL

When I play I sweat, just the way it is. Big soppy mess that's me.

Fleece jackets would frequently get too warm, are heavier, don't compress much, and are frequently too absorbent. Best planned as a mid-layer due to complete lack of wind resistance, but this means you're wearing a shell too so not great to depend on for active wear.

Shell jackets become a sauna when on the go. Save them for the coldest/most insistent wind or rain, their hoods will also seal you off from the rest of the world.

Softshell jackets seem to combine the the best and the worst of shell and fleece jackets with less flexible utility than separate pieces. You'll likely still want to carry a waterproof shell and maybe a lighter sweater when you need a touch of warmth working hard, all increasing overall pack size/weight.

Down jackets lose all functionality when they get wet and most have no resistance to moisture from inside even if they do have dwr treatment outside. Save them for sitting around when you have kitchen duty or otherwise can't move around to keep warm.

The Atom is my perfect go everywhere layer.
Great balance of wind resistance where I want it but highly breathable where the heat gets dumped.
Synthetic insulation is warm, remains warm when wet, and dries quickly.
Water resistant (treated) exterior panels will shed a light shower.
Functional hood that is less "crunchy" around the ears so you might actually be able to hear your partner when its up.
Crazy light.
Packs to roughly the volume of a 1L nalgene, but frequently better not to compress it down and just stuff it around in top of pack then it takes up near zero space, is readily accessible, and can help keep gear dry.
Small and tough enough to stuff in your avy shovel pocket or just under a pack strap and not worry about it until you want it again.
On top of perfect functionality, this piece has worn fantastically. After a year and a half of rock climbs, mountaineering trips, hikes, backpacks, morning warms ups, and cruising around town the only difference I can identify is a bit of that synthetic funk and even that's not really noticeable after a good wash with oxy clean.

A baselayer (selected based on conditions) + the atom + 3L gore shell is my go to system for everything (summer overnight desert trips to spring backpacking to winter mountaineering) below 0F I add my Marmot Ama Dablam (as a mid) for hours running the stove. So far what this system doesn't handle whiskey makes unimportant :).

5 5

The comfort food of the clothing world

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

This is the most comfortable jacket I have ever worn. It is incredibly light, yet provides a lot of warmth. At the same time, the jacket does a great job of shedding excess heat through the fleece underarm panels, making it a solid piece for active pursuits. If you buy one of these, don't be surprised when you find yourself wanting to sleep in it.

Unanswered Question

So I am debating between the S and M i am 5' 7-8" and 145-150lbs i want to be able to add a layer like a hoody underneath so i don't know if the small would be to tight but i don't want the medium to be to baggy if i wasn't wearing a hoody under it. so not really sure what size to get any help is appreciated thanks!

4 5


  • Familiarity: I've used it once or twice and have initial impressions
  • Fit: True to size
  • Height: 5' 7"
    Weight: 145 lbs
    Size Purchased: small

My first Arc'teryx jacket. I bought this to wear as a 40-60 degree jacket in most weather conditions. The first day I wore it in 45-50 degree windy weather with a long sleeve Under Armour charged cotton t-shirt underneath. I was pretty warm through most of the day. The only gripe I have is that if the wind catches the side fleece side panels it will cut through the jacket some. So far it sheds water extremely well. This jacket does flex with the weather conditions to keep your comfortable. It is a little on the expensive side but the materials are top quality. The fit is exceptional. Small fit me perfectly, I am 5'7" 145 lbs.

Responded on

Hey, Ryan. just wondering how tight the small was? I am like the exact same height and weight as you but i like a little more room in my jackets and i want to be able to add a hoody underneath and was just wondering if you could do that with the small or if a medium would be better?

At the moment I'm looking for a super versatile, do it all, tough jacket that I can rely on in a multitude of conditions. I've narrowed it down between the Patagonia Nano-Air Hooded vs. this Arc'Teryx Atom LT Hoody. Could someone give me a breakdown on the pros and cons between these two jackets? I'm trying to find as much info as possible so I can make the right decision when purchasing my next jacket. I've only found one article online that discusses these two jackets exclusively, so if anyone can help me out, that'd be great! Thank you very much!

Responded on

The Nano Air will be warmer and a little more breatheable. The fabric on the Atom LT is tougher. Also the Atom LT is more fitted and slim. You can't go wrong with either jacket.

Responded on

check out the following link for a very thorough comparison,

5 5

Initial Impressions

  • Familiarity: I've used it once or twice and have initial impressions
  • Fit: True to size
  • Height: 5' 9"
    Weight: 175 lbs
    Size Purchased: Medium

I ended up purchasing the Atom LT after lengthy research for a lightweight, packable insulated midlayer that could also hold its own as an outer layer.

I just took it out this past weekend for a two night and 25 miles of backpacking in 25-45 degree temps with some freezing rain. These are my initial thoughts.

First off, because of the precipitation and wind I layered it under my Arc'teryx Beta LT Hybrid Shell when we were getting some rain. It kept me perfectly warm (not too warm, not too cold, just right) and held up to some of lighter precipitation with its DWR. It also is fairly wind resistant (I love the hood). The jacket packs well and is super light. I've seen some say that a con of this jacket is it doesn't stuff into its own pocket or whatever but Arc'teryx recommends stuffing the jacket into one of the arm which I did and it worked great (used it as my pillow while sleeping).

All in all, the jacket was warm, breathable, durable and held up to the elements fairly well.

Hey Jane Hwang.
The man in the photo... what size he is wearing? And what is his height?

Responded on

Hey Samer
My brothers height is 5'9" and he is wearing a size medium. I hope that this helps and if you need more help please feel free to call or chat into our customer service center and we can get you squared away!

5 5

Better Than Down?

  • Familiarity: I've put it through the wringer
  • Fit: Runs small

I was looking for a synthetic jacket that would perform better when wet than a down jacket. I fly fish and wanted something that could get a little wet.

I absolutely love this jacket. I normally wear a medium but after trying the jacket on I decided to get a large so that I can layer with it. I can easily fit a fleece jacket underneath it when the temperatures really get low.

With just a t-shirt, this jacket is perfect for 40-60 degree temps. Any colder and I will throw a light fleece underneath it.

I see that the LT is Hood compatible. If worn without a helmet is the hood too large on your head. I would like to use this jacket without a helmet for hiking.
Also, is this jacket a 2014 version and does the hood and waist have draw strings ?

Aside from the LT being warmer how would you compare the LT to Outdoor Research Cathode Hooded jacket ?

Best Answer Responded on


I can't speak to the comparison between the Cathode and the Atom LT, but this is the 2014 version with the hood and waist cinch cords. Even without the hood tightened down, it's not offensively big when worn without a helmet.

How well does this hold up as an outer layer? Looking for a swiss army knife type jacket... Lightweight/Compressible, Insulated, Water Resistant/Proof... Hoping this might be the right piece. Love Arc'teryx gear in general. Thanks for any advice on it.

Best Answer Responded on

Hey! Jacket definitely is water resistant but, not proof. I would also question the durability of this jacket on the mountain as an outer layer. As a around town jacket it is just fine, I would even wear it touring on the up but, on the down snagging trees and what not you really need a hard shell or at least the burlier version of this jacket in the AR version,

Responded on

The Kappa Hoody might be a better piece. Similar fit, a little more rugged and feature laden. A versatile piece in its own right.

5 5

Comfortable and Light

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

Awesome jacket. Packs down very small and provides excellent worth for a light jacket. My favorite part is the comfort. It doesn't feel like your wearing anything at all. I have slept several times in this jacket and for some reason I think the comfort it provides has helps me sleep better outside.

5 5

Favorite Piece of Gear

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

Everest Base Camp, 4-season backpacking, international travel, the kid's soccer games... This jacket goes everywhere with me. It is amazingly warm given it's light weight and compact size. It layers well, breathes great, is a little water resistant (it's not a rain coat, of course) and is sooooo comfortable. The newly-designed hood fits nicely and keeps out the wind & cold.

Rather than endlessly shower compliments, I'll just say I'm an avid hiker/backpacker and gear hound. This, folks, is my favorite piece of gear.

Favorite Piece of Gear
5 5

Greatest Piece in my Kit

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

I've had this jacket for over 2 years and I feel compelled to share my sentiments. If you are considering buying this jacket, do it. You will most certainly get your moneys worth. I've put this jacket through the wringer and it is still in great shape; the zipper works, the adjustable hem is still functional and there are only a 2 holes. I've worn this jacket while climbing and the fabric is extremely abrasion resistant. You don't have to worry about thrashing this piece in a chimney because its tougher than you are. This jacket has become my favorite layer for skiing and I always take it with me over my UL Down. I'll wear it on a cold day while ascending and it does pretty well regulating body temp. I generally wear this with a long sleeve Cap 2 (Patagonia) and my hardshell over them both. It is a killer mid-layer. I probably wear this jacket on average 4/7 days a week during the entire year. I've had my Ghost Whisperer down from MH for half as long and the zipper on that jacket broke and the adjustable hem ripped out. This jacket is not as warm as down, but is ideal for active pursuits. I wear it when I'm reading a book at home or cruising around town. I will always have this layer. 5'8", 160 M fits great.

EDIT: I totally wear this jacket everyday, shamelessly.

Responded on

Hi prap, Just curious on the fit for you, I am the same height and weight, but occasionally have trouble with arc'teryx chest being too small. Do you know what your chest measures? Thanks.

Responded on

Hey, I do not know what it measures. I'm sorry! I say go for it and if it doesn't fit send it back!

5 5


  • Familiarity: I've used it several times
  • Fit: True to size

Lightweight, very soft, lightly insulated, and sufficiently warm. Ideal for every day use and layering when it's very cold.

The sides are made of a stretchy material to assist with breathability and mobility, the zipper is smooth and easy to use one-handed, the hood is great, and the collar hits high enough on the face to help keep out the cold. No complaints, and I'm not sure if I'll ever buy another jacket.

This seems to be an updated model with a reflective chest logo (I've seen chest name tags on older jackets), a darker grey and brighter red interior (on the carbon color), and an improved wrist elastic.

I'm 5' 5" and wear large T-shirts, but the medium is a perfect fit. The hem ends mid-zipper, right below the openings to my pockets, and the sleeves are just right, where they don't bunch up but are long enough to put my hands inside.

This layers perfectly with the Arc'teryx Rush jacket (also a size medium), allowing for great mobility, warmth, and breathability. I use the Atom LT for just about everything, and layer the shell when it's raining, snowing, or freezing.

If you're looking for something a little lighter, the Atom LT insulated vest is the same thing but without a hood and sleeves.

5 5


  • Familiarity: I've used it several times
  • Fit: True to size

I have only had this jacket for the past two months and have used it almost everyday since. The jacket is lightweight, but provides the layer you need when hitting the trail or walking around town on a cold day. Training with a weighted pack covering distance and elevation, this jacket breathes and does not build up the layer of moisture that many create while pushing the pace. The hood is easy on and off depending on my needs and will easily accommodate my climbing helmet in March for my Rainier winter climb. The Atom LT Hoody is form and function built into one jacket.

5 5

Should be renamed the Workhorse

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

It's pretty simple. You can use this jacket for just about anything. Running around town and need a quick outer layer? Check. Ski touring and need a breathable jacket? Check. Stuck in the blizzard that will end the world as we know it and use it as a mid layer? Check. You really don't have to take it off until the temps get above 70. Enjoy the best value purchase you will make this year.

5 5

Love this jacket!

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

This is one of the greatest jackets that I own. I love it so much that I have two different ones. I'm 5'9" and 160 lbs and the Medium fits me perfectly. This jacket is super warm for its weight. I will wear this thing by itself down to about 20 degrees F, and all they way up to 60 degrees F, so it's crazy versatile. I no longer take fleece jackets backpacking because this jacket is lighter and packs smaller. I pack this jacket into it's own sleeve to make it easy to store. This thing does shed some moisture, but if you put this under a hard shell, you'll be able to battle most elements that mother nature is going to throw at you.

5 5

Great All Around Jacket

  • Familiarity: I've used it several times
  • Fit: True to size

This has quickly become my go-to jacket because of its perfect combination of ample warmth, light weight, breathability, and wind blocking capability. I also really appreciate the minimal design--I feel like Arc'teryx generally trims their products down to the bare essentials, and this jacket is a great example of that. I can easily take it from an outdoor setting to a more professional environment without worrying because of its low-profile look.

So far I've mostly used it commuting to school on my bike in temperatures ranging from 20-40 and it is perfect. It breathes fairly well and blocks the wind like a champ. I generally only wear a t-shirt underneath and it is definitely warm enough for me. In light precipitation the DWR finish does its job and the water will bead up and roll off, which is nice but will probably only last for a little while. The hood works really well at sealing your head from the elements and the cinch is a really nice addition from last year's model, in case you need to tighten it up a bit. My only complaint with the hood is that it doesn't move very well with my head, which makes visibility somewhat of a problem when cycling, but it's not a huge deal.

I am 6' 2" 185 lbs with fairly long arms and the large fits perfectly--not too snug, not too loose. I noticed some people complaining about the zipper not staying up, but haven't had a problem with this so far. The construction is top-notch and the subtle elastic cuffs are a great feature. All in all this is probably the most versatile jacket I have owned and I would recommend it to anyone.

Responded on


Are you all torso at 6'2" or all legs? I'm 6'7" and taller on the torso side. I'm wondering if the Large will have enough length in the torso for me.