Still as effective as ever, the NANO PUFF from Patagonia is a micro down jacket perfect for mid-season climbing or short ski touring trips. This men's model is for both mountaineers and skiers, its versatility adapting to many circumstances.Ready for mountain adventures, this slim-fitting down jacket features a windproof outer material made from 100% recycled polyester that resists moisture and makes layering easy. Extremely compressible, water repellent and low bulk, the 60 g/m PrimaLoft Gold Insulation Eco filling, now made of 55% post-consumer recycled fiber, is very effective at retaining heat. This filling remains the most thermally efficient synthetic insulation on the market.The jacket has a slim fit with preformed side panels with close horizontal padding, and adds a soft, sweat-draining inner storm flap and chin protection with a zipper guard. The interior zippered chest pocket doubles as a storage bag (with carabiner attachment). There are also two zippered handwarmer pockets, elastic cuffs and a double drawstring waist to keep warm and protect from the wind.