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Sizing notes

SHORT: Some pants are available in short sizes, which generally means an inseam that is 2 inches shorter than regular sizes. TALL: Some pants are available in tall sizes, which generally means an inseam that is 3 inches longer than regular sizes.


Rated 5 out of 5 by from Adhitya Jayasinghe This Atom LT Hoodie is hands down my favorite jacket. Not only does it look good and have a flattering slim silhouette, it will keep you very warm. I bought it for the Northeastern winter (USA), and have yet to really test it's limits. The lowest temperature I have worn it in is around 25-30 F and felt comfortably warm. The best part is, I have worn it in 60 degree weather and felt equally as warm. The jacket does a brilliant job of regulating heat, which is probably my favorite quality of this piece. If you're looking for a mid-layer that can be worn in a mild winter as well as spring, this is should be your go-to piece!
Date published: 2015-12-15
Rated 5 out of 5 by from Retire Your Fleece --> Atom LT The Atom LT is an amazingly versatile piece of gear. Most of the jacket is wind resistant nylon that helps keep you warm in blustery conditions, while the stretchy fleece side panels are very breathable. The weight of the insulation in the Atom LT is slightly more than a winter weight fleece but so much easier to layer with as you can slide it on and off and under other layering pieces with ease. In the 40s perfect for town roaming around town with a T shirt underneath. In the teens, it is great under a hard shell as a layering piece for skiing or as an outer layer for fat biking with long under wear underneath. This is the new mid layer of choice perfect for so much.
Date published: 2015-09-25
Rated 5 out of 5 by from Excellent light-weight and versatile jacket This is a really, really good piece of design and craftmanship. It can be used in the city, with a classy touch or on your mountain ascent. I live in the arctic circle in Norway, and it is perfect for spring and autumn usage. I love the details and quality. The seams are perfect (some jackets have bad seaming) and the insulation is wonderful. The materials are so comfortable that this is my "go-to-jacket" for most cases. For colder conditions (-10>) I use heavy-duty down-jackets. If I would recommend this jacket? YES. The "bang-for-buck" is really good with this jacket! If you are obsessed with quality and form-factor - this is the jacket for you!
Date published: 2013-10-19
Rated 5 out of 5 by from Best Jacket I've Ever Owned I've owned this jacket for five years, and it is still my favorite jacket in my closet. I wear it during three seasons of the year, and for every activity: hiking, x-country skiing, downhill, snowshoeing, fishing, and climbing. It has excellent mobility and, after five years of almost daily use, it's still in fantastic condition. I have washed it about 10 times so far, and it hasn't damaged the insulation. This jacket is near perfect. My wife had to talk me out of buying another one last week because my current one isn't beaten up enough yet to warrant another purchase.
Date published: 2014-12-12
Rated 5 out of 5 by from Smooth Not sure why, but there was skepticism to first believe that this jacket could be as good as everyone claimed since it doesn't feel like anything; however, another convert there is, as this is as warm and comfortable as advertised. Wearing only a Motus short sleeve underneath, it felt normal in temperatures around 0 celsius and didn't cause overheating even at 10 celsius. This is much superior than anything else in terms of lightness, pack-ability, windproof and even water resistance. It's feels like smooth sleeping bag material, except softer. The jacket drapes well and matches Arcteryx's sizing's. Unfortunately, this jacket may just replace all others...
Date published: 2012-11-06
Rated 5 out of 5 by from Perfection achieved Purchased this out in San Diego while attending a skydiving school knowing that it was the winter and that I would need something else to add to my layering system. It was the last one left, as usual with most arc'teryx products, and for good reason. I made 22 skydives with this on and never felt too hot and was never cold. It held up to 130 mph winds as I free fell and kept on coming. Then on my off time I climbed two peaks in southern arizona. The desert scrub, briar, and cactus plants never mananged to tear the jacket. I was simply amazed with the product that this company has put out.
Date published: 2012-03-04
Rated 5 out of 5 by from Another stellar design I picked this bad boy up as insulation under my Alpha SV jacket. When I first put it on, I found the hood to be very odd. No way to cinch up the opening so I was at first unimpressed with that part of the design. Otherwise a great piece of equipment that is really light and surprisingly warm given its size. Back to the hood issue, I put the Atom on, then I put my Alpha SV jacket on, and since I live in Vancouver and it rains for 8 months of the year, I put the hood on the Atom up and then put the hood of my Alpha jacket on and it all made sense. I have never in my life owned an umbrella and when it rains I just put my hood on and thus am 100% waterproof.
Date published: 2012-11-04
Rated 5 out of 5 by from You won't want to take it off I've had a lot of outdoor gear over the years. I have always been a fan of down filled jackets. I am a total convert. it is warm, soft and light. It compresses really easily in a pack and for travel. I have since bought a second LT and an SV. The LT is great for 3 season activities - hiking, camping, ski touring in warmish weather and running on a cold day. I tend to use the SV around town (Vancouver) all winter and under my goretex shell for downhill skiing. Both are also terrific on a light rainy day - doesn't soak through unless it is pouring down. Love the fit, hood, everything about it.
Date published: 2013-04-12
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Questions & Answers

Is this jacket packable? If so, into chest pocket or hand pocket?

Asked by: Tommy19
It stuffs into one of the arms (no zipper). Go to the Arcteryx website and you'll see a video of how it works.
Answered by: Porsche Fan
Date published: 2017-04-05

Are the sleeves of this jacket lined?

Asked by: Wade Maples
Yes, the sleeves of this jacket are insulated with Coreloft.
Answered by: REIservice
Date published: 2017-11-25

What is the cold temperature rating for this jacket?

Asked by: OrangeGato
We do not provide temperature ratings on clothing because warmth depends on so many different variables including activity level, metabolism, perspiration as well as the other clothing layers you are wearing.
Answered by: REIservice
Date published: 2018-01-29

Is this jacket is waterproof?

Asked by: Amir A
The Atom LT Hoodie is water-resistant, not waterproof.
Answered by: REIservice
Date published: 2018-01-29

is the hoodie detachable???

Asked by: Willy13
The hood on the Atom LT Hoodie cannot be detached.
Answered by: REIservice
Date published: 2017-11-23

how do you measure sleeve length?

Asked by: momma
Start at the base of the neck, measure over the shoulder and down to the wrist.
Answered by: REIservice
Date published: 2017-10-10

Can you wear the hood without a helmet or do you wind up with a lot of extra fabric?

Asked by: golby
The hood can be worn without a helmet.
Answered by: REIservice
Date published: 2018-01-02

is this jacket packable? If so, into which pocket?

Asked by: Tommy19
The Atom LT is very packable. You can Store the jacket inside its own pocket (left), or tuck it into a sleeve or inside the hood if you are not restricted by space. A quick shake restores the original loft, time and again.
Answered by: REIservice
Date published: 2017-11-23
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