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Arc'teryx Proton Crew Men is a versatile, breathable, lightly-insulated crew works as a standalone or midlayer. Soft and comfortable, ultralight Octa® Loft insulation’s combination of warmth and breathability maintains thermal comfort. The air-permeable Fortius™ Air 50 outer is light, durable, and has performance stretch. A DWR treatment repels moisture. Midlayer or standalone, you’ll wear this for everything the mountain offers.