In it for the long haul, the Nike Zoom Rival D 9 has all the support you need to run farther and faster. Flywire cables keep the foot locked in place, while a no-sew overlay in the heel adds extra support. Phylon midsole with molded medial arch for responsive, supportive cushioning. Pebax spike plate with six removable spikes for traction on the track. Includes 1/4" pyramid spikes and a wrench. Wt. 6.4 oz.