The New Balance 5000 racing flat is designed for track/speed workouts and road racing up to 10,000 meters. FantomFit skeletally engineered upper provides ultralight support and fit by fusing two extremely thin materials with a no-sew process. RevLite RC midsole is engineered for greater responsiveness. DynaRide high traction, featherweight rubber outsole delivers superior performance. Wt. 2.5 oz.