Arc'teryx Atom LT Pant

Priced: $172.74 - $189.00 Rated:   - 4 stars out of 5 by 4 reviews.
Arc'teryx Atom LT Pant
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Color: Black
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Arc'teryx Atom LT Pant -

The Arcteryx Atom Pant. Designed to keep you warm on the coldest days, or as an extra outer layer when belaying or during low activity moments in the mountains.

FEATURES of the Arcteryx Atom LT Pant.
SPECIFICATIONS of the Arcteryx Atom LT Pant.


  • Articulated knees and seat allow for a more ergonomic fit whether you're sitting around the fire or trudging through pow


  • Moisture resistant outer face fabric with DWR finish
  • Breathable, stretch fabric has a Durable Water Repellent finish that helps bead up water on the surface; wind resistant
  • Luminara - 100% nylon


  • Coreloft 60™ insulation delivers lightweight warmth during cold conditions
  • Warm and resilient synthetic Coreloft insulation

Weather and Wind:

  • DWR finish sloughs moisture to keep you dry


  • Full length separating side zippers means you can easily enter or exit the Atom LT pants even in a cramped tent or when you're wearing boots
  • Full-length separating side zippers; bottom snap closure on zipper


  • Fully separating side zippers with laminated windflap allow for easy removal over boots and crampons


  • Articulated knees and seat aid comfort and movement


  • Elasticized waist; adjustable cuffs; internal stow pocket with attachment point
  • Lightweight warmth in a compact package - stuffs into its own hanging pocket


  • Arc'teryx Atom LT pants are lightweight, compressible and packable
  • Fully articulated knees and seat for freedom of motion
Oregon Mountain Community
The Arc'teryx Atom LT Pant is a lightweight, synthetic, insulated pant.
You don't mess around when it comes to proper layering in the bitter cold, which is why the Arc'teryx Atom LT Insulated Pants fit the bill for your next sub-zero adventure. Extremely light and packable, these pants feature Coreloft insulation to trap your body heat without bogging you down with excess bulk.


The Arc'teryx Atom LT pants are insulated and weather-resistant, making them ideal as an outer layer to preserve warmth during down time on your alpine adventures.


Mountain Gear
For colder days on the mountain or at the belay station, the Atom LT Pant from ARCTERYX warms you up without adding bulk.
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Average Price History: Price History
Review RatingNumber of Reviews
Fabric:Nylon / nylon blend
Inseam:76.0 cm
Inseam (in.):30.5 inches
Insulation:Coreloft polyester fibers
Insulation Material:Coreloft
Insulation Type:Synthetic
Internal Gaiter:no
Material:Luminara - 100% Nylon, Coreloft 60 insulation
Scuff Guard:no
Shell fabric:Nylon
Shell lining fabric:Nylon
Side Zip:Full Zip
Side cargo pockets:No
Sun-protective fabric:No
Weight:12.5 oz / 355 g
Compare specifications to related products.

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Arc'teryx Atom LT JacketArc'teryx Atom LT Jacket$138.99 - $199.00
Arc'teryx Atom LT HoodyArc'teryx Atom LT Hoody$137.99 - $229.00
Arc'teryx Atom LT Hooded JacketArc'teryx Atom LT Hooded Jacket$218.95 - $219.00
Arc'teryx Atom LT VestArc'teryx Atom LT Vest$114.99 - $145.00

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Arc'teryx Atom LT Pant Reviews:

Positive Reviews:

For those who have everything!

My five star rating is based on my expectations of course. I will start with my favorite features of these pants. They fold into a pocket and compress down to a 5"/4" envelope that sits about 3"'s high. So with this compressibility, carrying them in a pack for back-country outings is a no brainer. In no way would I recommend these pants as an active outer layer. I am afraid that dog walking could be too much for these pants. Dog nails, thorns, and branches could seriously f-these up. Crashing while skiing will rip the crotch if you wear these as a under shell insulating layer. This is not a con but a reality and a trade off for such convenience. In my mind these are great because you can un-zip these pants straight down the legs and throw them over your alpha sv bibs in two minutes with out shedding a thing saving much warmth and time allowing you to focus on the business at hand, such as setting up snow camp while the slower ones are arriving. For sleeping in a motor home with no heat the atoms make great pajamas. For running from a shower across snow at an rv resort the atoms are great. There is no waist draw string, just a one size fits all elastic band. If you intend to use these solely as a back-country campsite over layer you might want to get xl's if you are 5'10"-6'1". The length can be a little short especially when you are sleeping. Remember don't get these thinking that they are a cheap in on the arcteryx nameplate for resort skiing!!!!
Phiatouren at Mountain Gear on 11/11/2012

ok im 6 150lb, got the medium fits alright over the base layer , they are pretty warm no sure how much they can hold up to right now i got outside since its 19F to test my lt hoody and pants and im kind of surprised while wearing them with out base layer i didnt feel any cold at all , wind was about 5-10m/s.
anyways, i have about 6-7 arcteryx products and what ive noticed you can only use them exactly what they are made for nothing more while other companies make a bit havier shells and outer layers on hard shells or mid shells to get product lighter. After using couple arcteryx products i think better choice will be to go few grams heavier but durability will be much higher also as versatility. So im giving these pants a 4 for lack of versatility.
another thing they say ''Full length separating side zippers means you can easily enter or exit the Atom LT pants even in a cramped tent or when you're wearing boots'' OK yes you can... Who wears mountaineering boots inside the tent? Putting them on during climb or hike while you got hit by the cold yea i get it, but knowing temperature and condition of a trip i probably would have them on anyway before at start so i dont really get why they even have those full zips there to be honest.

Alex D at on 12/25/2013

I felt the need to review these pants after reading the over-reaction from the pant's only other review. These pants are well made and will function every bit as well as the Atom jacket, which I love. I use this gear to insulate me when I am glassing for game on windy cold peaks, during extended back country hunting trips. The pant isn't full of "bell and whistles", which I prefer because it's one less zipper to run off track and one less piece of Velcro to grab and tangle my other gear in my pack or laundry basket. They aren't made to be bombproof or feature-rich technical pants, they are made to be ultralight and warm, like a sleeping bag, and I think they do that job very well.

grap333901 at on 12/10/2013

Negative Reviews:

To me-these pants are useless.It may work for you - I hope.Sizing is good.I'm M (32")
The good:
1)It is arc'teryx
2)Pretty good lookin pant,lightweight,comfy,exceptionaly warm to its weight just like the atom lt hoody jacket which I love and hate at same time because the lack of hood drawcord.
The bad:
-No side(hand) pockets (no big deal for someone)
-No back pocket( again-no big deal)
-1 kinda hardly accesible inside zipped pocket when worn.(I don't like it)
-These pant are made from very delicate material-there are no seat/knees reinforcement.
I don't think these pants will last too long even with minimal usage.
-PROBLEMS starting here:
-!!-Side zip- if you get really warm in these - there is no way you can use the side zip for ventilation(lack of velcro strap/snap button at the waist,also lack of second slider)
-!!-One zip slider only (at the bottom)This delicate slider is unprotected/overhanging the pant about 0.5 inch so if you step on it - you're done with the pulling part of the slider.(you better carry two paperclips in your pocket if this happen)
-I can imagine myself wear this pants in the cold(spring/fall) mornings preparing my coffee/hang in the camp.These pants are perfect for that. But if you need some more serious/technically featured pant - Go with M.H. Compressor pant!! Lightweight-but heavier than atom pant!
MH-compressor: seat+knee reinforcement/2zipped side pockets/2 sliders(at top and bottom)/2 velcro straps(at waist and bottom).These pants can be used for ventilation.You can pull zippers with your gloves on.Free stuff sack included. $29 cheaper and much ,much better. And they don't really look to bad at all!
These arc'teryx pant may really work nicely for someone.
For me,again- I don't see the point of the side zipper without at least waist velcro(also second slider needed).
If these pant are designed for: insulated pants are designed to keep you warm on the coldest days, or to be used as an extra outer layer during low activity moments in the mountains........Well for the coldest days you better have compressor pant on you-much warmer! You may be ok at 36F with an polartec layer in these.What is low activity moment in mountains?-Camping at snow,sitting on rock and enjoying view? Well-for camping at snow go with KAPPA AR but not Atom.Sitting on rock-you better have reinforcement seat.Finally- Once you cold - you cold,period. If you warm-you have a problem because you gonna sweat and these pants did not offer you any venting options.
I would not recommend this pant to any of my friends because lack of important features for "insulated-full zip" pant.

tom2952697 at on 11/28/2011