A perfect mid-layer jacket. As far as weight and packability goes this one nailed it. There's really no reason not to always have this jacket in your pack.

(Posted on 5/10/13)

I have to say I was excited about this jacket.
The day that I receive this jacket it was 37 degrees and a little windy. So I put it on and walk out side. All I had was a base layer,a t-shit and Atom LT jacket. I don't feel cold at all. Very warm. The quality of this jacket is superb. Very soft/light weight jacket. I'm 5'11" 185lb so I went with Large. Fit perfect. Highly recommend this Jacket.

(Posted on 1/21/13)

To start, I have only had this jacket for a couple of weeks, that being said I love it! It has made all of my fleece jackets obsolete. This jacket is amazingly light, warm, and high quality. The jacket allows for complete range of movement and feels like it was made for my body. For reference I am 150 pounds, 6'1" bought a Large and it fits extremely well. The attention to detail is awesome on this jacket. This is my first Arc'teryx piece but it will most definitely not be my last. Also US-Elite is absolutely amazing, I do a lot of online shopping and have not dealt with a better company, and that is saying a lot. Keep up the great work guys and be safe.

(Posted on 12/31/12)

This amazing lightweight jacket has replaced all of my other jackets now. Keeps you warm and toasty in cooler weather without weighing you down. The subdued Arc logo on the matte black is a nice touch too.

(Posted on 12/23/12)

I agree with all of the reviews written so far. I like this as a mid-layer piece when climbing since the material doesn't feel super rugged but I do wear it as a jacket more frequently. It's surprisingly warm even when wet. I'm 5'9" 170lbs & I have this in large so I can layer underneath so a medium would be more snug. All Arc'teryx products move with you like second skin. Amazing weight to warmth ratio. Highly recommended with or without the hood.

(Posted on 9/25/12)

The Atom LT is always in my day pack, it hardly takes up any room or adds much weight when compressed. It exceeds a regular fleece lined sweater or hoody in terms of warmth while having all the features - 2 zip front pockets and an inner breast pocket. The Arc'teryx logo (for the Black version) as with some of their other products, is done with a reflective print. Attention to detail and quality is what makes Arc'teryx products worth investing in.

(Posted on 9/16/12)

I'm not tactical at all, just looking for a comfortable lightweight jacket for fall/winter to layer with heavier coats or wear on a brisk day. This was the perfect choice for me! Grabbed it during a sale and love it so far. Water runs off the material in beads you can literally see running down the jacket and not soaking in. It's breathable but kicks ass when layering because it traps in body heat very well. Would recommend this to anyone looking for a premium light jacket! Also have seen a demo of someone packing the entire jacket into one of the pockets (haven't needed to yet, but very cool that it's that compressible!).

(Posted on 8/3/12)

Probably per ounce, the most useful and versatile garment I own. Works well for brisk nights and light rains, the fabric nevertheless still gives you complete range of motion (even when climbing). This has now replaced all of my fleeces. The weight, compressiabiltiy and performance of this item cannot be beat!

(Posted on 7/18/12)

This is a light insulated jacket made for cool to lower tempature activity. It can be compressed and packed when not in use. The crocodile color is more of a darker OD Green with coyote blend, it's not as bright as the pic seems. I still like the color as it doesn't stand out as I thought it would. Hand pockets have zippers and are a bit concealed. The liner is the same material as the outer, fleece is on the collar. Stiching is good for being a imported product.
Overall a very light insulated jacket for a large tempature range.

(Posted on 7/16/12)