New Balance Men's Mx20v6 Minimus Cross Trainer 100% Synthetic/TPU Imported Rubber sole Shaft measures approximately 2.75" from arch Revlite midsole, Vibram Outsole No-sew material application Meta support Asym collar with molded foam allows for a more natural heel fit 4 mm drop: due to variances created during the development and manufacturing processes, all references to 4 mm drop are approximate