Upper is made of technical fabric with water-repellent properties that ensure protection and durability; Strong and supportive, External molded heel counter provides rear foot stability and containment; Bascula Adaptive System (BAS) increases traction and improves stability; GORE-TEX ePE membrane offers excellent performance and makes the boots waterproof and breathable; Sock-Fit XT construction system that fits the foot like a sock; Compatible with semi-automatic crampons