The Nano-AirA(R) Light Jacket was made to be worn for the entirety of your aerobic, start-stop mountain activities, so you&';re never slowed down by having to change layers. Stretchy and breathable FullRangeA(R) insulation dumps excess heat when you&';re working hard and keeps you warm when you&';re not. Product Features: Shell and lining fabric built from 100% recycled polyester ripstop is stretchy, breathable, abrasion resistant and comfortable next to skin, with a durable water repellent (DWR) finish made without intentionally added PFAS to resist light moisture 40-g FullRangeA(R) insulation is warm, stretchy and exceptionally air permeable; combined with the shell and lining, this provides excellent mobility and breathability Articulated patterning and strategically placed, low-profile quilting combined with stretchy fabric and insulation provide an exceptional range of motion for unhindered movement Center-front zipper has a zipper garage at the chin for next-to-skin comfort Two handwarmer pockets and one chest pocket are zippered, low profile and low bulk to wear comfortably with a harness or a pack; jacket self-stuffs into the left-chest pocket Sleek, low-bulk, snag-resistant cuffs allow stretch to keep warmth in and pull up over the forearms for visibility and temperature control; a cleanly finished hem seals in warmth Product Specifications: Fabric: Shell: 2-oz 30-denier 100% recycled polyester air-permeable stretch ripstop with a durable water repellent (DWR) finish made without intentionally added PFAS. Lining: 1.6-oz 30-denier 100% recycled polyester air-permeable stretch shadow ripstop with a DWR finish made without intentionally added PFAS. Migration-resistant insulation: 40-g FullRangeA(R) 100% recycled polyester. Fabrics are certified as bluesignA(R) approved Weight: 11.7