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Arc'teryx Proton Insulated Pant - Men's


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Proton Pant

The Arc'teryx Men's Proton Insulated Pant warms up frigid alpine climbs with a performance-oriented design geared for staying active at high altitudes. Its air permeable Fortius Air 40 fabric delivers incredible breathability to keep comfy on long approaches and steep climbs, and it has a rugged . Octa Loft also promotes active-worthy breathability as well as thermal protection from cold temperatures. Arc'teryx fitted it trim to fit under hardshells, but you can certainly wear the pant on its own when there isn't much rain or snow.
  • Insulated pant designed for alpine climbing
  • Fortius Air 40 fabric is weather-resistant and air permeable
  • Octa Loft insulation maintains warmth and breathable comfort
  • Trim fit layers under hardshells with ease
  • Elasticized waistband offers a comfy, snug, harness-friendly fit
  • Zippered thigh pocket laminated to pant for a seamless feel
  • Item #ARCZ970

Fortius Air 40 (92% nylon, 8% elastane)
Octa Loft (100% polyester)
trim, straight leg
[short] 30in, [regular] 32in, [tall] 35in
1 zippered thigh
Claimed Weight
Recommended Use
climbing, trekking, mountaineering, ski mountaineering
Manufacturer Warranty
limited lifetime

Tech Specs

What do you think about this product?


>Rating: 3

Toasty but no hand pockets

I returned this product before using it
True to size
Size Bought
5` 11"
150 lbs

I realize these are meant to be closer to a base layer and you may have a shell with pockets over them, however as a stand alone pant with no hand pockets or butt pocket it was a deal breaker for me. Very warm though and true to Arc sizing IE small was about a 32 waist