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Too many alpine shiver-fests can leave you mumbling incoherently and sporting a thousand-yard stare. Worth more than its weight in gold for core warmth and cold-weather sanity, this high-loft vest provides such ultralight, compressible warmth, you won't think twice about throwing it in your pack. Its durable, supremely efficient synthetic insulation (now 100-g PrimaLoft One) traps heat even when wet, and the DWR (durable water repellent) 100% all-recycled polyester shell (1.5-oz 32-denier; lining is 1.4-oz 22-denier) blocks wind and sheds snow. Pockets: two handwarmers and one interior zippered chest that doubles as a stuff sack (with a carabiner clip-in loop). Drawcord hem. Recyclable through the Common Threads Recycling Program.