Anti-torsion TPU arch plate provides maximum stability on the trail. Vibram rubber outsole bites into sketchy terrain for great traction and grip. Impact Brake System offers superior grip on very steep terrain; slanted and opposing lugs absorb 20% of the shock on feet, knees, hips, and back while walking on hard ground. * Ergonomically shaped, durable PU/EVA midsole cradles the foot for an excellent fit. Lightweight, flexible midsole provides stability: co-molded PU/EVA is supportive and soft�provides form-fitting, shock-absorbing platform for hiking and backpacking. 7 mm Ergoflex nylon insole provides support underfoot; allows forefoot flex. * Tough Ingrasatto leather upper with nubuck leather cuff withstands trail abuse. Gore-Tex membrane for waterproof protection and breathable comfort. Symbios, ergonomic constructed upper wraps naturally around the foot and works with the shock-absorbing midsole to help reduce negative impact on hard ground. * Cordura and stretch Lycra tongue gusset provides breathability and comfort and reduces bulky fabric overlays. 3D Flex ankle allows uninhibited maneuverability on technical terrain for greater stability. Rubber rand at toe and heel for protection and durability. * Symbios construction balances protection, comfort, flexibility, and function with an ergonomically shaped PU/EVA midsole and ergonomic last which hugs the foot and provides the best fit possible.