When you need to get up to get down, this packable layer prioritizes breathability for the ascent and insulates on the descent. FEATURES: Stretch Breathable Lightweight 20D Nylon/Spandex Plain Weave Water-Repellent Coated Fabric Slim fit sits close to the body, with room for the garment to move with you Breathable with light wind resistance for medium-intensity activities where breathability is a higher priority than wind resistance and added layering helps provide warmth Thermacore stretch insulation [40g] for focused warmth and enhanced breathability; [ak] DWR coating Packable into a pocket; Lightweight low-profile back of hem cinch Pocket utility loop and media port; Reflective details Zippered internal chest pocket and hand-warmer pockets Products made with bluesign materials use only safe chemicals and reduce impact on both humans and the planet during manufacturing