Featuring a sleek, lightweight design, the Reebok Z Run helps you reach your fastest speed and best results. The NanoWeb PU cast supports the foot and offers protection in key areas. For a comfortable performance, EVA midsole cushions your step and provides a smooth-feeling stepping motion. No-Sew upper and lightweight Bootie Fit System enhance fit. Sleek last and a fully flexible design promise a natural feel. Plus, the medial and lateral underfoot grooves allow the midsole to flex and expand, increasing edge and ground contact for a smooth, quiet ride. To ensure long-lasting traction, the outsole showcases strategically placed CRTek rubber. Wt. 7.0 oz.