Built for the quickness and explosive starts in short-distance sprinting, the New Balance SD100v1 Sprint Shoes has a sleek, engineered upper that secures the foot and molded midsole that provides ultra-lightweight fit and support by fusing extremely thin materials with a no-sew process. Tech Specs & Features:Ideal for 50 - 400 meter racingSkeletally-engineered FantomFit upper that provides support and fit.6-spike Pebax® plate, high-strength thermoplastic polymer outsole offers great flexibility and impact-resistance.Internal shankWrapped rubber outsoleStandard 1/4 inch spikes