When worn on its own or under a shell, the Patagonia Women's Nano Puff Insulated Vest provides lightweight, compressible, and wind-resistant insulation for your cool-weather romps. The Nano Puff Vest features PrimaLoft Gold Eco insulation, which not only boasts a partially recycled constitution, but it also retains body heat with acute thermal efficiency. And unlike down, PrimaLoft Gold Eco maintains its insulating capacity when wet, which makes this vest an ideal choice when moisture may be factor. Now, because of its synthetic insulation and moderate warmth-to-weight ratio, Nano Puff caters to a variety of activities, ranging from cold-weather trail runs to blustery days on the skill hill. A hardy, wind-resistant ripstop exterior deters grabby tree branches on the trail, and the DWR treatment is designed to handle light drizzle. A zipper garage protects your chin from chafing, and the brick quilting pattern prevents the insulation from settling and creating cold zones on your body. An internal chest pocket doubles as a self-stuff sack so you can easy store the Puff in your tote bag or daypack, while the two zippered hand pockets keep necessities close by.