Vibram FiveFingers Mens KMD Sport LS Shoes polyester UPPER - Polyester Fabric and Nylon Mesh SOLE - TC-1 Rubber FOOTBED - 2mm Polyurethane + Microfibe EVA arch follows the contours of the foot and reduces weight. 4mm Vibram performance rubber outsole for grip and protection without compromising ground feel. Popular use for running and fitness Machine washable. Air dry away from sun or heat source.