Conquer peaks or crush your local crag in style with the Arc'teryx Proton Lightweight Hoodie. This climber's dream provides breathable, thermal comfort that adapts from midlayer to standalone. With cutting-edge Octa® Loft insulation and resilient Fortius™ Air 20 fabric, it's your go-to for durable wind resistance and freedom of movement. 84% Nylon, 16% Elastane, Octa® Loft Breathable Insulation, Durable Water Repellent Finish, Light Wind Resistance, Adjustable Insulated Hood, Adjustable Drawcord Hem, 2 Zip Pockets, Arc'teryx. Arc'teryx Men's Proton Lightweight Hoodie Stone Wash