Designed for the distance warriors, the Saucony Endorphin spike provides lightweight and comfortable fit and feel. Runners will appreciate this ultra-lightweight and seamless upper for plenty of flexibility during longer track races. This spike is suitable for races at 2 miles and up. Upper: Ultra-lightweight FLEXFILM with no-sew overlays offers an enhanced fit with extra weight. Flat laces reduce irritation and pressure points. Padded heel collar enhances comfort. Midsole: SSL EVA offers lightweight responsive performance. Outsole: 4-spike Pebax® plate configuration provides the best possible propulsion. Comes with 8 spikes and wrench.