The classic Patagonia Women's Nano Puff Full Zip Jacket is windproof and weather-resistant enough to wear as an insulated shell in a gusty snowstorm, trim enough to pull on for chilly rock pitches (and still see your footholds), and warm enough for light belay parka duty on quick alpine dashes. The wind-blocking, moisture-shedding 100% recycled polyester shell also glides effortlessly, whether worn as an outer or midlayer. Low-bulk, hydrophobic, highly compressible PrimaLoft® One (60-g) insulation traps heat with remarkable efficiency, even when wet. It packs down to practically nothing and stuffs into an internal zippered chest pocket that has a carabineer clip-in loop. It also has two zippered handwarmer pockets, elasticized cuffs and a dual-adjust draw cord hem to seal out wind and seal in warmth.