Combining an ultralight windproof Pertex Quantum Air Ripstop shell with PrimaLoft Gold Active insulation makes the Mountain Hardwear Kor Stasis Hoodie a no-brainer for high altitude winter athletes looking for a puffy that breathes like mad, moves with you, and works like a charm even when damp. A must-have mid-layer for backcountry skiers and snowboarders who get after it in colder weather.