New Balance Men's 510v3 Trail Running Shoe 100% Leather/mesh upper Imported Rubber sole IM ethylene vinyl acetate midsole Weight: 348 grams (12.2 oz) AT tread outsole. PU Sockliner. Injection molded EVA (Ethyl Vinyl Acetate) 12 mm drop: due to variances created during the development and manufacturing processes, all references to 12 mm drop are approximate NB ultra soft comfort insert