The New Balance 1600 racing flat features a FantomFit skeletally engineered AirMesh upper that provides ultralight support and fit. Created by fusing two extremely thin materials with a no-sew process. RevLite RC midsole is engineered for greater responsiveness. DynaRide high traction, featherweight outsole delivers superior performance without a base layer of rubber. Blown rubber outsole. Wt. 5.0 oz.