By blending durability, breathability, warmth, and stretch into the Nano-Air Jacket, Patagonia created a versatile, work-horse midlayer for your aerobic start and stop missions in cold conditions. This slim-fitting jacket is filled with Patagonia's revolutionary FullRange insulation. FullRange insulation blends the warmth and breathability of other synthetic insulation with the stretch and flexibility of fleece to keep you warm, comfortable, and mobile as you trek, climb, and ski. The face fabric has a high stretch as well while providing durable, abrasion-resistant protection for confident exploring. A DWR treatment to the fabric helps excess water bead up and roll away, rather than sit on the jacket surface and slowly sink into the insulation when you get caught in a surprise storm.