For a quick dose of core warmth, zip up the Patagonia Mens Micro Puff Vest and relish in the lightweight, compressible PrimaLoft One insulation. From the crags to the ski hill, this windproof insulator packs a high warmth to weight ratio and works as an outer layer or under a shell. The Micro Puff Vest stuffs into its interior zip pocket for easy transport, and its recyclable through Patagonias Common Threads program.