The 2.8mm Hydrobloc Tuscan full-grain leather uppers ensure excellent protection from elements Gore-Tex Performance Comfort membranes offer maximum water protection and breathability and are guaranteed for the life of the boot by Gore-Tex Zamberlan Vibram StarTrek II soles feature PU construction with a TPU frame and a TPU stabilizer for the utmost in support and lightweight durability. The tread is robust, easy to clean, strong for downhill braking, and extremely durable Perforated calf leather is laminated to the Gore-Tex Performance Comfort membranes to give the feel and comfort of a leather-lined boot, while simultaneously extending the life of the Gore-Tex membrane. This is similar to the lining of the Zamberlan 1030 Sella NW GTX RR A full rubber rand using an elastic rubber compound and beveled edges underneath (non-visible to prevent catching and reduce delamination), encircles the entire boot and prolongs the life while enhancing protection to the foot in rough terrain