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

The essential particle.

While carrying a jacket for every kind of weather you might encounter may appeal to your inner gear geek, it's a whole lot easier to carry one layer that will handle just about any inclement weather you face in the high mountains. The Arc'teryx Men's Proton LT Hooded Insulated Jacket puts versatility at the top of its strengths with a breathable and weather-resistant softshell face and water-resistant Coreloft synthetic insulation. Arc'teryx's Fortius Air 40 fabric is air permeable to prevent overheating while you're on the move, but resistant to wind, water, and snow when clouds gather over your objective. Coreloft insulation adds lightweight warmth that is quick to dry, whether it gets wet with sweat or snow. Arc'teryx gave the Proton a climbing-specific design with a trim fit to reduce needless bulk, articulated arms and gusseted elbows for climbing mobility, and a hood that fits comfortably over a climbing helmet.

  • An insulating layer adept at climbing rock, ice, and alpine granite
  • Coreloft insulation is lightweight, compressible, and quick-to-dry
  • Softshell is air permeable and resistant to water, wear, and wind
  • Arc'teryx NU treatment repels water, oil, and stains
  • Stretch knit cuffs lock in warmth
  • Adjustable drop back hem for added coverage
  • Gussted underarms and articulated elbows allow full range of motion
  • Trim fit ideal for climbing and hiking
  • Reviews
  • Q & A

Fit Review

  • Fit: Runs small
  • Size Bought: Medium

40" chest
32-33" waist

I didn't buy this, but tried it on at the local Arcteryx store in Boston while shopping for a new shell. I have an Atom LT, so I'll compare it directly to that.

Fabric: Seems more durable than the Atom, and more closely resembles the Gamma series in overall feel, which I prefer.

Fit: It feels trimmer overall, and is most noticeable in the waist and arm holes. The waist is fine for me, and had enough room for a t-shirt and wool baselayer. I have larger shoulders, and the arm holes felt restrictive in the pit area. I can't tell if it's fabric build-up, or needs more room in the arm hole/chest , but I found it uncomfortable, and wouldn't like it for everyday wear.

Open up the pit area a bit, and I'd probably take the Proton over the Atom.

Best All Around Jacket I've Owned

    I just put 5 Patagonia mid layer jackets on eBay & I'm buying another Proton as soon as they sell! I went ice climbing on a bluebird day that started windy and in the teens and peaked at 37 (F) and I didn't have a breathable layer. I bought the Proton LT before heading out and it performed amazingly ALL DAY long! That was two weeks ago and I haven't taken it off since... The best part is no static shock like all my Nano PUFF & NP Airs EVERY TIME I took them off. 6' 205lbs the L was climbing comfortable but I went with the XL for all around comfort 5 Stars +++

    Best All Around Jacket I've Owned

    From the rack to the ice


    From the rack to the ice

    So So So great

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

    I also have the Atom LT and love that jacket. But the extra water and wind resistance in this jacket is fantastic keeps me toasty as a stand alone jackets even when temps drop into the teens. Its practical in the backcountry, but also casual and sharp looking in town. Super happy with this jacket and definitely digging the external chest pocket for all my extra chapsticks.

    Warmth in Any Weather

    • Familiarity: I've used it several times
    • Fit: True to size
    • Size Bought: Medium

    Whether you're waiting your turn on the crag, chasing face shots on a powder day, or if you're simply trying to look good on a Friday night, the Arc'teryx Proton is perfect for any activity.
    It provides enough warmth to make an amazing outer layer on brisk spring or fall days and an even better mid layer on colder days, while you're riding the lift up to get that perfect line.

    Insulated jacket for any activity

    • Familiarity: I've used it several times
    • Fit: True to size
    • Size Bought: Large

    The Arcteryx Proton LT Hoody is a super breathable and dynamic insulated jacket that excels when you're getting active. It's a great outer layer for hike in the fall, and as soon as the temps drop, throw a shell over it, and you'll find that it's not too bulky, and allows your body to breathe while staying warm. The fit is trim, so it can layer easily - if you like a more generous fit, you may want to consider sizing-up. I am 6'2" 185 and the Large is great for me.

    Unanswered Question

    Compare to Patagonia Nano-Air hoody or jacket which feels more durable with outer material?

    I can not decide between jackets. Thx.