Unleashing a futuristic design, the adidas Springblade running shoe is built to enhance your running performance. The revolutionary blade design captures energy and releases it on rebound, powering every step with explosive energy. For a secure fit, the synthetic upper features TECHFIT� power bands that wrap across the forefoot. External heel counter for lightweight support. GeoFit� heel collar comfortably supports the ankle. To ensure a smooth running experience, each of the 18 TPU blades are precisely calibrated to the specific shoe size. Wt. 12.6 oz.