The Patagonia Nano-Air® Jacket is a highly breathable synthetic insulation piece, designed to be worn for the entirety of your aerobic, start-stop alpine missions, so you’re never slowed down by changing layers. Warm, stretchy and breathable FullRange® insulation dumps excess heat when you’re working hard and keeps you warm when you’re not. Now improved with significant recycled content in the shell, liner and insulation. Fair Trade Certified™ sewn. Nano-Air Jacket - Men's