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, the Patagonia Micro Puff Vest for Boys is a high-loft vest that 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 H2O repellent) 100% all-recycled polyester shell (1.5-oz 32-denier; lining is 1.4-oz 22-denier) blocks wind and sheds snow. With quilted side panels, two invisible-zip handwarmer pockets and an interior zippered chest pocket that doubles as a stuff sack (with a carabiner clip-in loop). Drawcord hem.