Micro-denier polyester fibers for lighter weight, luxurious drape, breathability, strength and durability; Mountain Weight warmth without added bulk; MTF polyester moisture transfer fibers for increased moisture management; Micro-Elite Chamois gussets under arms, hips and at cuffs for a closer fit and increased performance; Zip through collar with interior wind flap for ultimate warmth; Extended cuffs with thumbholes; Zip pocket on chest; UPF 40 protection