The Asolo TPS 520 GTX combines a durable and supportive full grain leather upper with an exclusive chassis developed with Vibram, offering a dual density polyurethane midsole for long term cushion. Gore-Tex? lined and seam sealed for all weather, all conditions hiking.Exclusive midsole uses low density polyurethane surrounded by high density polyurethane for shock absorbtion and durability Co-partnered Vibram outsole with Aso brake, designed for confident downhill traction Asoflex plate provides twisting resistance for ankle support Gore-Tex? lined seam sealed upper Avg. Wt. 3lbs, 12oz.