The Patagonia Women&';s Nano-Air Ultralight Full-Zip Hoody is a feather-light, ultra-breathable insulator built for high-output days in the mountains. It pairs stretchy, air-permeable FullRange insulation with a whisper-thin recycled nylon ripstop shell, so you can keep it on from the approach to the summit without overheating. Warm, stretchy, and packable into its own pocket, it&';s the layer you reach for when the pace never stops. Features: 40-g FullRange stretch insulation: Highly breathable, warm, and stretchy for stop-and-go aerobic activity. Ultralight recycled ripstop shell and lining: Whisper-light nylon with a DWR finish that sheds light moisture. Exceptional breathability: Air-permeable construction dumps excess heat so you stay comfortable on the move. Stretchy, articulated fit: Moves with you while trimming down for easy layering. Self-stuffing chest pocket: Packs into its own zippered pocket for compact, grab-and-go storage. Fair Trade Certified sewn: Supports a premium that goes back to the people who made it.