Arc'teryx Mens Proton AR Hoodie Elastane^Nylon^Polyester^Synthetic Imported 6" high 13" wide PROTON AR HOODY - An all-round, versatile hooded jacket created to balance warmth and airflow, the Proton AR Hoody is the warmest option in the Proton series. ALL ROUND - High performance weather protection and materials, emphasizing versatility for multiple activities. ALPINISM & CLIMBING - Climbing equipment designed for efficient movement and protection in alpine environments PROTON - Air permeable mid layer insulation with abrasion and weather resistant.outer surface. SYNTHETIC INSULATION - Man-made insulation with quick dry times, durability and retains warmth when damp.