Perwanger Nepal Suede Leather special tanning process bonds to the fibers for water-repellency durability and breathability; GORE-TEX Performance Comfort membrane for maximum weather protection; BAS midsole allows lugs to independently adapt to the terrain, maintaining better ground contact; External molded heel counter provides rear foot stability and containment; Sock-Fit XT construction system that fits the foot like a sock; Compatible with semi-automatic crampons