The Patagonia Men&';s Nano-AirA(R) Light Jacket is a breathable, stretchy active insulator built to move with you during high-output cold-weather pursuits. It&';s filled with lightweight FullRangeA(R) synthetic insulation that&';s exceptionally air-permeable and stretchy, so you stay warm without overheating - no need to stop and shed layers. A DWR (durable water repellent) finish sheds light moisture while the mechanical-stretch shell and lining keep it comfortable on the move. Features: FullRangeA(R) active insulation: Lightweight, breathable, and stretchy warmth for stop-and-go activity. Air-permeable and quick-drying: Dumps excess heat so you can keep moving without overheating. Mechanical-stretch shell and lining: DWR-treated for weather resistance and unrestricted movement. Zippered handwarmer pockets: Secure storage for essentials on the trail. Elasticized cuffs and hem: Seal in warmth and block out drafts. Fair Trade Certified(TM) sewn: Supports a premium for the people who make it.