Change is good. But changing layers every five minutes? We have better things to do. With soft, high-loft fleece insulation on the inside, and breathable, abrasion-resistant Pertex Quantum Air stretch fabric on the outside, the Kor AirShell Warm Jacket is a dynamic duo of technical performance. The jacket's active insulation keeps you warm and fends off wind and light moisture while remaining incredibly breathable, so you can keep skiing, running, climbing, or hiking.