Uptracks and traverses, transitions and descents – backcountry travel is not linear. Output, temperatures, and conditions shift, and you need to stay comfortable through it all. Insulation balancing warmth, airflow, and protection – this is a go-to backcountry piece. Features: Proton series: Air permeable mid layer insulation with abrasion and weather resistant outer surface GORE-TEX INFINIUM™ at the yoke and hood delivers zonal durable windproof protection and helps shed light snow and sleet Fortius™ Air 50 outer balances warmth: airy four-way stretch fabric is soft, comfortable, wicks moisture FC0-DWR (Durable Water Repellent) finish repels moisture Coreloft™ synthetic insulation provides warmth with minimal weight and bulk Articulated patterning for unrestricted mobility RECCO® reflector aids search and rescue in emergency situations Hood configuration: Low-profile, GORE-TEX INFINIUM™ hood Single pull adjuster does not restrict vision Fits under a helmet Full front zip Arc'teryx Bird logo Chest pocket with zip Two hand pockets with zippers Adjustable hem drawcord Fitted fit: patterned to stay close to the body through the chest, waist, hip, and thigh. Its low profile eliminates bulk, moves with the body, and fits comfortably under outer layers Weight: 365 g Sustainability: contains materials that meet the bluesign® criteria Materials: Contrast: 2L GORE-TEX INFINIUM™ with PFCec-free DWR Self: Fortius™ Air 50 - 84% Nylon, 16% Elastane - FC0 DWR Lining: 20D plain weave - 100% Nylon Insulation: Coreloft™ 40 (40 g/m²) - 100% Recycled Polyester Arc'teryx Men's Proton Hybrid Hoody