Arcteryx Alpha LT Jacket - Men's Nylon, plain weave N40p-X exterior is a supple and lightweight face for high performance GORE-TEX Pro Shell 3L Athletic e3D patterning provides room for three layers while facilitating movement Helmet-compatible StormHood rotates without blocking vision WaterTight pit zippers permit rapid ventilation; two hand pockets, one internal pocket Hem drawcords and HemLock removable inserts prevent jacket from slipping out from underneath harness