Time-honored and field-proven, from starlit mornings through benighted evenings, our Nano Puff® Pullover remains indispensable. It’s both an insulated pullover in late-fall squalls and a micro-belay parka on chilly rock. The Nano shuts out wind, sheds snow and traps heat – even when wet – with PrimaLoft® Gold Insulation (60-g) an incredibly warm, low-bulk, compressible and hydrophobic synthetic insulation. The sculpted fit opens up with a deep-venting half-zip that has a soft, wicking interior storm flap and zipper garage. The windproof, 100% recycled polyester ripstop shell glides effortlessly in your layering system, and the pullover packs down to practically nothing and stuffs into a single chest pocket that has a carabiner clip-in loop. Elasticized cuffs and hem seal out wind and trap warmth.