The Zamberlan 6000 Denali RR boot is best suited for high elevation mountaineering and ice climbing. They feature single piece uppers, thick premium grade HydroblocA(R) leather, tough hardware, stiff midsoles and VibramA(R) outer soles. These hand-crafted, European-made beauties won&';t let your toes down when it really matters. External gaiter made of CorduraA(R) fabric in the upper area and CorduraA(R)/KevlarA(R) in the lower area to ensure thermal insulation and abrasion resistance Riri StormA(R) waterproof and UV ray resistant zip with protective cover Inner, removable bootee specifically developed to grant warmth, lined in mesh for better internal ventilation Thermal removable footbed with a PE layer for cushioning and an aluminum film for optimum insulation Carbon fiber + fiberglass midsole ensures maximum rigidity and lightness VibramA(R) sole for extended durability and grip ZamberlanA(R) PCS system for crampons