Shell and lining fabric is built from 100% recycled polyester ripstop with mechanical stretch, exceptional breathability and improved abrasion resistance, with a durable water repellent (DWR) finish made without intentionally added PFAS to resist light moisture Light, breathable and stretchy 20-g FullRangeA(R) insulation provides featherlight warmth through the hood, shoulders, upper arms, chest and back; breathable underarm panels vent heat and reduce bulk Minimally bound, stretchy Light Touch Expansion Hood with passive adjust fits with and without a helmet and easily pulls on or off, even when the jacket is zipped; center-front zipper has a zipper garage at the chin for next-to-skin comfortSlim fit built for comfort under a harness and a backpack, and articulated patterning provides exceptional range of motion Low-profile, generously sized chest pocket keeps essentials warm and close at hand; entire hoody easily self-stuffs into the chest pocket with a carabiner clip-in loop Stretchy, soft, moisture-wicking and quick-drying CapileneA(R) Cool Lightweight fabric at the lower arms adds extra stretch to push up sleeves over forearms Shell and lining: 1.6-oz 30-denier 100% recycled polyester air-permeable stretch shadow ripstop with a durable water repellent (DWR) finish made without intentionally added PFAS. Lower-sleeve panels: 2.3-oz 100% recycled polyester double knit with a wicking finish. Insulation: 20-g FullRangeA(R) 100% recycled polyester. Fabrics are certified as bluesignA(R) approved