Ultra-light maximal cushion midsole designed by Brandblack for Vibram High traction rubber outsole and shank for mid-foot support Ultra -Light 2 way stretch mesh upper for comfort and strength Fused internal microfiber reinforcements and padded collar area Outsole: 100% Rubber Upper Sole: 29% Leather 46% Mesh 25% Synthetic Slim fit (a size larger is recommended for absolute comfort)