Upper: 3.2mm silicone impregnated Idro-Perwanger Roughout Leather with high-abrasion resistant fabric and Vibram XSV Rand * Innovative 3D Flex ankle provides optimal upper hinge * GORE-TEX Duratherm insulated, waterproof lining for exceptional foot comfort * Vibram outsole with Impact Brake System for reducing impact by 20% and increasing traction by 20% * 8-9mm TPU with shock absorbing PU inserts is more pliable than the men"s model to better match lighter weights