Arc'teryx Proton Pant WLightweight warmth, temperature regulating airflow, performance stretch the Proton Pant is all mountain versatile. Wear it as a midlayer in cold conditions, or pull it on as a standalone for hikes and approaches. Ultralight Octa Loft knit insulation combines warmth and breathability, air permeable Fortius Air 50 outer is light, durable, and stretchy, and a DWR treatment repels moisture. The trim fit layers easily, and articulated patterning works with
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