The Mizuno Geo-Silencer track shoe is recommended for distances from 400 meters to 1600 meters, as well as hurdles. Fit Straps help increase power through an enhanced fit. AP midsole is made with a lightweight, responsive, yet durable cushioning copolymer. Full-length, elite level, middle distance spike plate promotes power by providing superior traction and minimizing energy loss. Wt. 5.8 oz.