The Nike Zoom Fly SP Unisex Running Shoe is designed to meet the demands of your toughest tempo runs, long runs and race day with a responsive construction that turns the pressure of each stride into energy return for the next. This special edition of the racer updates the lightweight support system, and features design details inspired by the historic Breaking2 attempt. Powerful, Propulsive Feel A full-length, carbon-infused nylon plate within the midsole feels like it propels you forwards with every step, so you're just that much closer to your goals. Smooth, Responsive Ride Lunarlon cushioning combines soft and firm foam for a balance of shock absorption, stability and response, without sacrificing comfort. Lightweight Support A translucent, stretch-woven upper delivers lightweight breathability, while a soft, microsuede arch band provides support and stability for your most challenging miles.