Our exceptionally stretchy, breathable 100% recycled polyester Nano-Air® fabric is a longtime favorite of mountaineers for its ability to simultaneously maintain warmth and dump excess heat and moisture. This daily shirt jacket is designed to keep you warm, dry and traveling light in cool climates. The Men's Nano-Air® Shirt Jacket is fully backed by our Ironclad Guarantee and you can find it on Patagonia.com. | Patagonia Men's Nano-Air® Shirt Jacket in Ink Black, Large - Recycled Polyester