We built this down jacket for high-altitude mountaineering and other activities in extreme-cold conditions. Lightweight, super-durable shell is waterproof/breathable ripstop polyester. Insulated with high-loft Premium Down. Interior mesh pockets for gloves or goggles. Drawcord waist and adjustable cuffs seal out cold. NOTE: Temperature ratings are based on a controlled laboratory test by an independent university lab. Also consider: your sensitivity to cold and wind-chill; time of exposure; activity level; and use of layering.Models shown are 6'0" to 6'2" tall, wearing size M/32x32.