Arc'teryxAtom LT Jacket - Women's

Stretch on the sides, warmth in the middle.

The Arc'teryx Women's Atom LT Jacket is the skinniest full-jacket member of the Arc'teryx Atom family, but don't let the sleek profile fool you. The Atom LT packs a wallop of warmth when mid-winter marathon training finds you outside pounding snow-packed pavement in Minot, North Dakota. And thanks to its trim fit, this slick little number also works well under a shell when the weather dictates more hardy protection.

Coreloft 60 insulation leans towards the lighter side of the Coreloft cabal, and does not cover every inch of your upper body. Deliberate design puts the insulation where it matters most: your core, arms, and shoulders. Along the jacket's sides and under your arms, you'll find Polartec Power Stretch with Hardface technology. This four-way stretch fabric accommodates your every move, and Hardface technology ups the ante on abrasion resistance. The non-insulated panels also help the jacket breathe so you don't become the steaming carne asada inside a toasty synthetic insulation burrito.

As with all members of the Atom family, the Atom LT can be shoved into its own sleeve for packing efficiency and economy of size when space is a premium. The DWR coating fortifies the water-repelling aspect of the shell fabric, while the air-permeable polyurethane layer enhances the shell's wind resistance. Articulated elbows and underarm gussets give your arms free range of motion whether you're dancing in the firelight or fighting for the final pitch. From dawn patrols to winter running to shoveling the driveway after a late March dump—whatever your preferred poison, the Atom LT will keep you warm through the bitter end.

  • Coreloft 60 insulation at arms, torso
  • Polartec Power Stretch at side panels, underarms
  • DWR finish
  • Tinthan 100% nylon
  • Trim fit
  • Reviews
  • Q & A

If You Don't Have One, You Should!

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

The Atom LT is my go-to puffy and ultimate layering piece for everything outdoors. I wear it under a shell skiing and as a stand-alone jacket on chilly days. It keeps me warm enough in cold temperatures, but breathes well enough that I don't steam up. It has stretchy side panels made of Polartec Power Stretch that are flattering and vent heat, while still keeping you warm. The pockets are even fleece lined to keep your hands extra warm.

While the performance of this jacket is amazing, the comfort of this jacket is even more impressive to me. I would literally wear this jacket every day if I could. It is so soft and feels like butter when you're wearing it.

Another consideration when purchasing a puffy jacket is durability. I've had mine for eight years now and it still looks as good as the day I bought it.

The fit is slightly trim fit, but tapered. If you like a slim look, go for your regular jacket size, if you want extra room for layering, size up.

I'm often asked as a Gearhead what my favorite piece of gear is. Hands down without hesitation, the answer is always the Atom LT. If you ever come into Backcountry's office during spring, summer, or fall, there is a seriously good chance you'll see me wearing one of my Atom LTs and a ton of other employees, as well. Basically, I can't think of a good reason not to have one.

If you want the warmest version of the Atom LT, get the hooded version, if you want an even lighter version, consider the vest.

If you have any questions at all about this jacket or even want to chat about how much you love yours, please call me at 801-204-4562 or email me at

She freakin loves it

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

She absolutely loves it and pretty much where is it with everything she owns it’s warm without being too warm and has just enough room that she can wear something under it she absolutely loves it

Great mid-layer or stand alone

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

The Atom LT jacket is a great addition to any closet! It has nice, breathable side panels that allows you to engage in high output activity without feeling the build up of perspiration inside the garment. This jacket is certainly an athletic fit (slim) and is a bit short on my torso - I am 5'8". A synthetic insulated piece such as the Atom LT is super versatile in all conditions, though I would recommend using it in milder temperatures such as 0 degrees celsius to -5 if you are going to wear it as a stand alone piece. I've used this jacket mountain biking, cross country skiing, hiking and camping.

A Great Multi-Purpose Jacket

  • Familiarity: I've used it several times
  • Size Bought: Small

I bought this for a friend who had the following to say:

"There is so much to love about this jacket! First, this jacket is incredibly lightweight, more like an insulated sweater than a jacket. Despite its light weight, it is incredibly warm. I wear it with the Sentinel jacket. I use the Atom LT as my insulation layer to keep me warm, and the Sentinel as a weather and wind-resistant outer shell.

Second, the Atom LT also can also can be compressed into a small space for travel. I do wish it came with a bag or could be stowed in one of its pockets. During the winter, I want to use this jacket constantly. Although, I would like a bag, its absence won't deter me from packing it everywhere I go.

Third, I think the thing I love most is the Atom LT is incredibly comfortable. It is longer in the back for great fit, extra warmth and comfort. It also has snug wrists that keep warmth inside where you need it. The side panels are great for breathability, and I can envision using this jacket in a wide variety of outdoor activities. The Atom LT is a great, functional jacket.

Overall, this is an Arc'teryx favorite for versatility. You cannot go wrong with this jacket."

Sleek, Stylish, and Warm

    This jacket has it all. It is compact, yet still very warm. It serves as a perfect outer layer for your daily needs, and can even be worn as an under-layer on those colder days! Definitely recommend this jacket to anyone!

    WOW love it and so many uses!

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

    Easy to pack, doesn't wrinkle, light weight, yet offers surprising warmth. I use it as a jacket to work, to bike or rollerblade, to cross country ski, as a layer under a shell for colder downhill skiing. Love the length a bit longer over the butt for extra warmth. It's close-fitting, yet the sides are stretchy so lots of movement. Have had this jacket for several years, well worth it. I got the roseberry color and love it. Most recently layered it under a shell for 8 degree skiing at Snowbird, UT! First time layering for cold and it performed perfectly!

    A touch of warmth

    • Familiarity: I've put it through the wringer
    • Fit: Runs large
    • Size Bought: L

    ... but really, just a touch. This is a great jacket for temps in the 30s (under a shell) or 50s-60s (alone) but if you're looking for some serious insulation, this is not for you. I know, it says "LT" -- take that seriously, and if you need something truly warm, go for the AR version instead.
    That being said, this jacket is fantastic when you just need a little warmth - super lightweight, very breathable, and very easy to layer over. Truly a 3-season jacket that can span a range of conditions. It's also very easy to layer over. I got the non-hooded version for maximum versatility.
    Like some Arc'teryx items, the fit is a bit of a mystery -- some things run small, while others are large; this one is in the latter category. If you're between sizes, I would recommend sizing down rather than up.

    Too short!

      I love everything about this jacket except for the length! I am on the shorter side (5'4) and I still find it too short. Such a huge shame! Because otherwise it is perfect as a jacket for between seasons.


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

      My wife has one of these and she loves it. The material is made out of dragon skin because she beats this to shit and has never had a rip or tear in the material.

      Insulation: its that perfect mid layer fill! keeps you warm!
      Fit: its going to be close to your body to keep you warm.

      Pro: Durable, Warm, and Lifetime Warranty

      Cons: she wished she would have gotten the one with the hood.

      Warm enough for a spring m'cycle ride!

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

      That's 5'-7" Katie in a size small Atom LT jacket. We rode my motorcycle to a walk around Ada Hayden Lake in Ames, Iowa and the Atom LT held back the morning's 26 deg wind chill temp. We both think the Atom LT is a great jacket (I've had mine for over 4 years). It's warm and lightweight and just feels great. With its athletic/trim cut, it looks great too. Highly recommended.

      Warm enough for a spring m'cycle ride!

      Patina Teal is Darker in Real Life

      • Familiarity: I gave it as a gift but have feedback to share
      • Fit: True to size

      The Patina Teal is a darker teal in real life. It's much more green-tinted. I gave this as a gift to the winter runner in our family, and she loves it! Although the color is not as pictured, she still loved the color.

      Interesting jacket

      • Familiarity: I've used it several times
      • Fit: Runs small

      Close-fitting jacket works great alone for cold biking or under a shell for skiing. Very lightweight but very warm for what it is. Stretchy on the sides, wind and waterproof elsewhere. Nice deep pockets, no pit zips, tight cuffs on the sleeves. Good for a variety of uses. Longer in back keeps your butt warm too. Attractive fit a lot like the women's Marmot fit. I found it to run just a touch small - maybe just felt that way because it is so close-fitting. My normal size worked. I will use it a lot. The product description is very accurate and like any Arc'teryx product, the quality is superb.

      Warm and light!

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

      I love this ultra light jacket. With its articulated sleeves and close fit it feels great over a light fleece or anything for that matter. Water beaded nicely in rain on last hike. It is a close fit, but has a little pouf to it - fabric feels light but takes a beating...Typical awesome Arc'teryx quality. Perfect for cold (not sub-zero) hikes and runs or with it's close fit, as a layering piece.

      My favorite jacket!!! :D

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

      I love love love this jacket!!! Here's some reasons why:

      - incredibly comfortable

      - super light

      - compresses down to pretty darn small

      - articulated elbows (no tight feeling when bending the arms or bunching on the inside of your elbow)

      - dries fast

      - small wrists (keeps out wind and great for layering)

      - smooth zipper (Arc'teryx quality everything)

      - fits and looks great

      This jacket is super awesome for a few different activities. I bought it initially for wearing with my drysuit (on winter river trips) because the slim sleeve design fits well under a drysuit with gasketed wrists, but then I found out once I had it, it's the best cold weather running jacket I've ever worn! (By cold, I mean cold).

      I am 5'5", 105 lbs, measurements are 30x24x34 and I went with a small. I could've done an XS (I tried them both on) and I went with the small for the extra length in the torse, but either worked fit wise.