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

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Atom LT Hooded Insulated Jacket

Who needs a multi-tool when you've got the Arc'teryx Men's Atom LT Hooded Insulated Jacket? Well, you don't—though, you might want to bring one along anyway (just in case). More specifically, the designers over at Arc'teryx made the Atom LT versatile enough to handle year-round mountain adventures ranging from climbing to skiing.

The Atom LT is constructed with a durable, breathable, and lightweight Tyono exterior, while the DWR treatment fends off light rainfall—meaning you stay relatively dry no matter what Mother Nature throws your way. To bolster its adaptability, the Atom LT is equipped with gusseted underarms and Polartec Power Stretch side panels to ensure an unimpeded range of motion whether you're wearing it as a midlayer or an external shell. Perhaps most importantly, though, is the Atom LT's synthetic Coreloft insulation. This synthetic insulation not only retains warmth in wet weather, but also offers maximum thermal efficiency without compromising the compressibility of the fibers. A StormHood slides over helmets with ease, and the adjustable hem provides a personalized, snug fit should you desire it.

  • A versatile, highly adaptive jacket for all aerobic activities
  • Tyono exterior is durable and wind-resistant for protection
  • DWR treatment sheds light moisture easily
  • Coreloft insulation keeps you warm even when wet
  • Stretch side panels promote unobstructed mobility
  • Articulated elbows and gusseted underarm bolster comfort
  • Helmet-compatible hood is insulated for added warmth
  • Adjustable hem provides a personalized fit and feel
  • Item #ARC004F

[main] 20D Tyono, DWR coating, [side panels] Polartec Power Stretch with Hardface Technology (88% polyester, 12% elastane)
60g Coreloft
yes, helmet-compatible StormHood
2 zippered hand, 1 zippered internal chest
Claimed Weight
13.4 oz
Recommended Use
climbing, skiing, backpacking
Manufacturer Warranty

Tech Specs

What do you think about this product?



Arc'teryx – Men's Atom LT Hoody

This trim hybrid hoody is designed as an active-use insulation layer, providing vital core warmth with liberal mobility and breathability. Lightweight and compressible, the Atom LT Hoody features Coreloft™ insulation in the torso, arms and hood. The side panels and underarms feature Polartec® Power Stretch® with Hardface® Technology, delivering stretch mobility and breathability. A wind and moisture resistant outer shell extends stand-alone usability. Fact: Every person at Head Office owns at least one Atom LT; most of the women have two. The reason: Coreloft™ insulation inside a light taffeta shell. All the comfort of a sleeping bag, but it feels weightless.


Perfect jacket for Winter

I wore this jacket for 12 days in Utah and the perfect for hiking, climbing and dining.


Climbing Ishinca

Wore the Atom LT the all the way up and down. All i had to do was open the jacket a bit to regulate my body temp.


Arc'teryx – Men's Atom LT Hoody

This trim hybrid hoody is designed as an active-use insulation layer, providing vital core warmth with liberal mobility and breathability. Lightweight and compressible, the Atom LT Hoody features Coreloft™ insulation in the torso, arms and hood. The side panels and underarms feature Polartec® Power Stretch® with Hardface® Technology, delivering stretch mobility and breathability. A wind and moisture resistant outer shell extends stand-alone usability. Fact: Every person at Head Office owns at least one Atom LT; most of the women have two. The reason: Coreloft™ insulation inside a light taffeta shell. All the comfort of a sleeping bag, but it feels weightless.


Pika Glacier Denali NP

Crevice rescue practice is warm work in cold places. Atom LT hoody is perfect to regulate temperature.


SoCal Weather

This jacket is great for everyday insulation for various types of weather and I chose this over the Atom AR because I felt it would be more flexible with the warmer temperatures in SoCal. I must admit though I was expecting it to be warmer for colder climates when I went to the mountains that reached to ~28 degrees Fahrenheit - I had to wear a warm fleece to keep myself comfortable. But for regular outings like camping, climbing, or just out in the town there is no better jacket out there!


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.


Atom LT kept me warm in Ireland!



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!


Atom LT Hooded Insulated Jacket


Its like wearing a sleeping bag!


Determined to catch dinner

Location: Vancouver Canada


I love that my brother uses this as often as me!


Height: 6' Weight: 170 lbs I want it to be fit, should I can an M or L?


Has anyone had any problems with the zipper? I haven't worn it yet but just pulling the jacket open when it's half zipped, tends to unzip really easy. Just concerned of it unzipping easily while doing things.

It's designed to be easily opened using one hand, without the other having to hold the other side. I know what you mean, but I really like how smoothly it opens. It shouldn't be sliding down on it's own, though.


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)?

I am the same height and 135 lbs athletic build, size small is a perfect fit for me, it is hip length


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. Kyle Expert Gearhead 801-736-4337


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.


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?

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.


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 801-736-6398


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.


How would you compare the warmth of this jacket to that of Mountain Hardwear Ghost Whisperer or another similar down jacket?

I think my Ghost Whisperer might be slightly warmer than my Atom. The warmth of any down jacket is going to be directly related to the loft. Thicker = Warmer. Note - Fill Power is a measure of how light and packable the down is. This is where the Ghost Whisperer blows most jackets out of the water. The atom still has an advantage in a lot of areas, however. It's more comfortable, I like the way it breathes better, I like the hood better, it's more abrasion resistant and it moves better. It's also going to do better in wet weather being that it's a synthetic. The Ghost Whisperer is still going to win in the lightweight and packable categories however so if that's your priority, then the ghost whisperer may be the way to go. The atom is probably the best jacket for 85% of situations and a favorite of a lot of people I've worked with over the years in this industry. I think everyone should have (at least) one.


Why is "rusted copper" a shade of orange? Shouldn't it be a shade of green? Just sayin'.

Rusted is describing a shade of the color copper, not a piece of copper that has rusted. Just sayin'.

Guess if they come out with "rusted iron" it will just be a shade of gray then.


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!

I would go with the small.


Center back length?

Medium is 30 inches long


Hello, 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!

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.

check out the following link for a very thorough comparison,


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

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! Cheers! Jane


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 ?

becks4312304945, 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.

Thank you Jeff


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.

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,

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

It will get wet pretty quickly in rain or very damp snow. More dry snow will be no problem, and it dries very well.


Does anyone know what is the main difference between atom leaf vs ordinary model? Does leaf atom model have 40d fabric? How does it compare in general to ordinary atom?

The main differences between the leaf model and the regular one are that the leaf has a more durable face fabric (called Gossamera--same fabric as the Atom AR), it is a few ounces heavier, has a "vertically routed" hip adjustment cord, and the color of the logo matches the fabric color. In my experience, the leaf model fits a little baggier. I ended up going with the regular model because it fits a little trimmer and is more packable, which is what I was looking for.

I use the LEAF Version- it is 2oz heavier and offers cord routing through the hand pockets in addition to using more durable face fabric.


I bought an Atom LT hoody about a year ago on BackCountry. I love everything about this jacket except for one major issue. The main front zipper will not stay all the way up when doing almost any sort of activity. It literally falls down 4-5 inches even when just wearing a backpack. I talked to Arcteryx with no resolve and was told it was by design to make one hand operation easy. My question is have they fixed this design issue for the new model this year? I love my jacket but this zipper issue is a tough one to overlook, just wish I could somehow get it resolved from a company like Arcteryx........

I asked my buddy who used to work at Arc'teryx and he also says that the zipper is like that by design for easy one hand operation. For instance, when you have a shell on and want easy access to some ventilation, you can unzip your shell and pull on the collar of the Atom LT to open it up some. While the zipper is soft, I have one myself and haven't had problems with it unzipping too much. So to answer your question, no, they haven't fixed this--but they also don't see it as an issue since it was designed this way. Still love this jacket!


Hi! What is the color of sleeves cuffs on green color? On official page I notice that they are grey but on attached picture i noticing they are same color as body color. Please let me know. Thanks!


I would go with the image that is on the official Arc'teryx website, which shows them as gray. Your image may be an older version of the jacket, or maybe a knock off.