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Arc'teryx Proton LT Hooded Insulated Jacket - Women's

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sale $224.25 Original price:$299.00

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Proton LT Hooded Insulated Jacket

Noticing that most "breathable" insulated jackets don't actually breathe that well during fast-paced activity, Arc'teryx designed the Women's Proton LT Hooded Insulated Jacket for high-octane alpine missions where thermoregulation is key to completing your lofty objectives. Instead of being merely breathable, the Proton LT is air permeable, meaning it allows rapid air exchange without relying on built-up pressure to expel condensed perspiration along the inside of the shell. Ultimately, this means you'll stay pleasantly dry from the inside-out, especially on those hard climbing objectives and long slogs en route to the summit.

The Proton LT is a great piece for cool transitional seasons, courtesy of its Coreloft Continuous insulation. This synthetic insulation won't succumb to soaking-wet conditions, meaning it won't clump together when wet and lose its lofting ability like down. The shell's DWR treatment beads off passing showers and snow, keeping you dry through light precipitation. For greater weather protection, layer it underneath your waterproof hardshell as a toasty mid-layer for backcountry skiing and alpine objectives in severe weather. Other key features for sealing out the elements include an adjustable hem, stretch-knit cuffs, storm flaps under the main zipper, and helmet-compatible hood with adjustable drawcords.

  • Softshell jacket for fast-paced alpine activities
  • Fortius Air shell provides air permeable protection
  • Coreloft Continuous insulation provides mid-weight warmth
  • DWR treatment sheds oncoming showers and light snow
  • Insulated, helmet-compatible hood with drawstring adjustment
  • Flaps underneath main zip for sealing out blustery conditions
  • Adjustable hem with dual drawstring adjustment
  • Zippered hand and chest pockets
  • Item #ARC00JU

[shell] Fortius Air 40 (92% nylon, 8% elastane), DWR coating, [lining] Permeair 20 (nylon)
65g Coreloft Continuous
Center Back Length
27.5 in
yes, helmet-compatible, insulated
2 zippered hand, 1 zippered chest
Claimed Weight
[size Medium] 13.3 oz
Recommended Use
alpine & expedition, skiing, climbing
Manufacturer Warranty

Tech Specs

What do you think about this product?


>Rating: 5

Proton - An Aerobic Atom

I've used it several times
True to size
Size Bought
5` 4"
125 lbs

I own the Proton AR (not the LT). Like the other reviewer mentioned, the Proton seems very similar to the very popular Atom from Arc'teryx. However, after owning this jacket, there's a very distinctive purpose and use for it! USE: Boiling down to it, I work out in the Proton, and I lounge in my Atom. Any heavy aerobic activity outside like backcountry touring or snowshoeing, the Proton is my go-to insulating layer. It breathes significantly better, so I don't want to rip it off me like my Atom when earning turns. Because of that I find it's colder and noticeably lets in more air (to the equivalent of lounging around at home the Proton AR is as warm as my Atom LT). MATERIAL: The outer material is great and possibly more water resistant than the Atom. I wore it in a relatively wet snow storm and it shook off the snow well. I still carry a separate hardshell for strong wind/storms. CUT: Note, the cut is longer than the Atom, which depending on your build can make it seem cut narrower. DETAILS: The two chest pockets are great for storing items. SIZE: I wear a Small in nearly all items, and I wear a Small with the Proton.

>Rating: 5

Great All-around Mid Layer

I've used it several times
True to size
Size Bought
5` 4"
128 lbs

If you are like me, you might be looking at this jacket and wondering what difference between this piece and the Atom LT jacket is, so from my experience thus far, here are a few items of note that might be helpful for comparison: - The Proton is more breathable, but I think the Atom might be a bit warmer. The breathability will be the biggest differentiating factor for this piece. - While the fits are supposedly the same or very similar, I prefer the Proton as the cut feels slightly longer and a little more tapered/feminine. The best way I can think of to describe the fabric of the Proton is that it is slightly more "porous" than that of the Atom. I can’t yet comment on the difference between the water resistant abilities but the Atom is better at blocking the wind. I also personally appreciate the extra pocket on the chest (which the Atom doesn’t have). I took the new Proton LT as the sole jacket on my recent trip to the Dolomites. It was much colder there than expected and found this jacket to be a great all-around piece, but because it is so breathable found it slightly less wind resistant. We did a hike to the North faces of Tre Cime di Lavaredo and saw varying conditions from light snow, to wind, and various elevation changes. Aside from wishing I had a hardshell for the more extreme wind and cold, it did a great job of regulating my temperature (particularly once I starting exerting myself) - I will be excited to see how it does this winter for SkiMo. As far as sizing is concerned, as with most all Arc'teryx articles, I sized up to a Medium.


Rad review. Rad Photo. Rad jacket. Thanks JJ. You're the woman!