The Patagonia Nano Puff Insulated Jacket carries the same climber-tested heritage that made the Nano Puff a staple, now with a fit refined for improved mobility. Reaching overhead or layering under a shell doesn't fight the jacket. The brick quilting pattern locks the PrimaLoft Gold Eco insulation in place, so warmth stays distributed evenly rather than migrating to the seams after a season of hard use. What Our Gearhead(R) Experts Are Saying:"This is the one so many people keep coming back to season after season. The PrimaLoft Gold Eco hits the warmth-to-packability ratio that makes it the jacket that actually gets worn instead of left behind."