Chilly mornings in base camp, simulclimbing by headlamp and cragging in the South Platte as snow flurries fall all give the Nano Puff Vest its raison d'Æ’†' ‚ªtre. The vest uses PrimaLoft Gold insulation (60-g) for superb compressibility, featherlight weight and surprising warmth. All of this is wrapped in a windproof and moisture-shedding 100% recycled polyester ripstop shell with a DWR (durable water repellent) finish. The vest has a shaped fit and a soft, wicking interior storm flap and zipper garage for chin comfort. Other fine points include a drawcord hem, two zippered handwarmer pockets and an internal chest pocket (with clip-in loop) which doubles as a stuffsack.