Xavier de Le Rue designed the Spark XV for big mountain destruction. Built to withstand abuse, this boot offers exceptional performance whether hiking, skinning, climbing, or riding. It's the perfect partner for pushing boundaries. This flagship backcountry boot is light on weight and heavy on features Custom Flex construction snuggly cradles the ankle while skinning and hiking New midsole and VibramA(R) East Ridge outsole provide a reduced footprint and enhanced cushioning The Dupont Surlyn highback contributes to the durability and stability of the boot. Combined with additional reinforcements, the highback also aids in dictating its stiffness. The waterproof and breathable D-Tex Membraine ensures your feet stay warm and dry. Precise stitching and a sandwich construction ensure water can't penetrate the boot's shell. After all, a dry foot is a happy foot. By securing the calf in place, the Powerstrap adds additional support to a boot's lacing system. Two separate lacing systems allow you to customize the fit and flex of the heel, forefoot, and shaft zones. Custom Flex Construction enables riders to adjust the support and responsiveness of their boots. And to further secure a rider's feet, this design also features ankle lacing.