When dramatic changes in weather, terrain, and physical demands can occur, alpinists need clothing created to meet the demands. Constructed from N80p-X GORE-TEX PRO 3L, a face fabric five years in development, the Alpha SV delivers exceptional durability, yet is supple and resilient. Engineered to shed water, snow and resist abrasion, the fabric's face utilizes larger yarns that are very tightly woven to create a smooth but highly abrasion resistant surface. Incredibly durable N155p-X GORE-TEX Pro 3L is used for reinforcement in high stress areas. High coverage in the chest and the back keeps out snow, drafts and retains essential body heat, and the harness friendly 3/4 length side zips show an attention to detail meant for people who go to extremes. Guides, climbers and anyone doing alpine work for extended periods in difficult conditions will immediately appreciate the women's specific design with its focus on fit and movement. The Athletic fit is streamlined but accommodates layers, and the Arc'teryx commitment to patterning for ergonomic freedom, especially vital while climbing, is a key aspect of the Alpha SV's performance. Features are carefully selected to solve specific problems climbers face. The low profile WaterTight zippers reduce irritation under a harness or pack, and the two large, easily accessible bellowed chest pockets lay flat when not in use. Arc'teryx developed the removable internal LegWrap as an effective means of pulling in fabric volume to reduce crampon snags. Keprotec instep guards shied from cuts and abrasion, and a bootlace hook help keep the cuff secure. The harness compatible crotch zip helps minimize exposure.