evo.com | Arc'teryx Synthetic > Meet the Proton Hoodie, an insulator fit for virtually any activity in the mountains and beyond. This clever piece of kit breathes better than a yoga instructor, thanks to its air-permeable PrimaLoft(R) insulation. It's like having a personal climate control system wrapped around you, keeping you just right whether you're scaling cliffs or conquering switchbacks. And with its recycled materials, you're not just staying warm - you're giving Mother Nature a high-five with every adventure. Zippered Hand Pockets 42% Recycled Nylon Fitted A trimmer fit is 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 over first layers or under outer layers. Fortius(TM) Air 20 | 84% Nylon / 12% Elastane with Durable Water Repellent (DWR) Treatment This face fabric has unrivaled hardwearing durability, over 60 times more durable in abrasion tests than the industry standard and is extremely air permeable. 60g PrimaLoft(R) Insulated Helmet-Compatible Hood | Arc'teryx Proton Hoodie Men's 2026 - X-Large Black | Nylon/Elastane