X ALP MTN GTX is an extra light, leather member of the X ALP family, delivering an ideal combination of agility, precision and support that mountain enthusiasts want for ridge ascents, easy climbing sections, and glacier crossings. Patented 3D edging chassis maintains a rigid lateral edge for climbing rocks, edging in snow or soft conditions, etc. while maintaining forefoot flexibility. High top construction, full Gore-Tex bootie and two layers of compressed EVA ensure protection from cold temperatures, weather, and rugged environments. 1.5mm Nubuck leather upper, protective toe and heel caps, and mud-guard ensure these boots withstand years of abuse. Material: Leather.