Change is good. But changing layers every five minutes? We have better things to do. With a soft airmesh lining 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.