The ALPHA AR men's jacket is a lightweight climbing and trekking shell for weather protection on exposed terrain. The waterproof Gore-Tex membrane is rugged and supple, reinforced in high-wear areas. Taped seams further water protection. Articulated engineering makes for enhanced movement. A helmet-compatible hood conforms to your motion. The underarms come with pit venting zips. Cohaesive adjusters securely the jacket hem from slipping out from under a harness.