Windproof and water-resistant, the Patagonia Nano Puff Vest is an ideal insulating layer or an outer layer in cold climates. This lightweight jacket is made with PrimaLoft® insulation for superior warmth with remarkable efficiency, even when wet. Additional features include two zippered handwarmer pockets, elasticized cuffs and a dual-adjust drawcord hem to seal out wind and seal in warmth.