Arc'teryx Alpha SV Jacket. A classic piece recreated using exceptionally durable, N80p-X GORE-TEX. Pro. This fabric is extremely waterproof and abrasion resistant. E3D patterning creates an ergonomic fit for extra ease of movement. Expedition fit leaves room for maximum winter layering. Traditional bellowed crossover pockets are accessible while wearing pack. Helmet compatible Storm Hood™, drawcords and pit zippers adjust with one hand. Removable HemLock™ inserts keep jacket in position under harness. Primary Use: Alpine/expedition climbing, mountaineering.