Zamberlan Hydrobloc full-grain leather uppers with a straightforward, clean, and effective design for long-lasting durability and protection Exclusive Zamberlan Vibram 3D outsoles are designed to provide excellent grip, superb downhill braking, and an energy-producing, rock-forward motion. Wide lugs are easy to clean Gore-Tex Performance Comfort membranes provide the utmost waterproof protection and breathability and are guaranteed by Gore-Tex for the life of the boot Microtex wicking nylon collar linings help control excess moisture around the ankle ZBPK Performance Fit last is renowned and exemplified in the 996 Vioz GTX as the upper creates a visible curvature around the back of the heel and wraps comfortably over the top of the foot while leaving enough room in the toe box to wiggle toe (up to size 15)