Ice climbers and alpine climbers move quickly, generate a lot of heat yet require waterproof protection from spindrift, water, and falling snow. Streamlined for light weight and energy efficiency, the Arc'teryx Alpha Comp Pant has a trim fit to maximize fabric technologies and reduce crampon snag, with e3D to accommodate free movement of layers. Fortius 1.0 stretch woven fabric regulates heat and provides stretch through the core areas and back of the knees. N40p 3L laminated GORE Product Technology provides durable weather protection across the seat, front of the legs and lower leg cuffs. Zippered lower leg adjusts to two volumes to accommodate different the needs of ski boots, alpine travel and climbing with crampons. Extremely durable Keprotec provides instep protection.