Marmot's Nano AS Jacket features extremely breathable, waterproof Gore-tex Active Shell technology in a lightweight, minimalist design with a helmet-compatible hood. SIZE MEDIUM 3-layer Gore-Tex Active Shell construction: Polyester shell fabric backed by Gore-Tex membrane and protective layer for next-to-skin comfort and durability Gore-Tex membrane provides durable waterproof, windproof protection and breathable comfort—allows sweat to escape to prevent overheating 100% seam taped for complete waterproof protection Helmet-compatible hood with water-resistant zippers Pack Pockets with water-resistant zippers—slanted pockets can be accessed while wearing a harness or pack Asymmetric cuffs with Velcro adjustment Elastic drawcord hem for adjustability in serious weather Angel-Wing Movement allows full range of motion in arms so jacket doesn’t ride up Center-back length: 26.5 in. Athletic fit