Secure, Cushioned, Comfortable 3 Flyknit components were placed in different areas of the shoe. At the tongue, seamless engineering has created soft padding and an adjustable fit. The vamp is soft, with a highly secure fit. And finally, the heel is built with a clip for containment and cushioning. The result is an upper that keeps your foot feeling comfortable and stable while you pound the pavement. Higher, Softer, Wider Higher foam heights provide an even softer feel. A wide, exaggerated shape at the forefoot offers a more stable ride. More Bounce With Every Ounce Nike ZoomX foam is responsive and lightweight, giving you bounce with every step. Shaped like a rocker, the foam provides support for the 3 phases of a runner's stride. It offers flexibility when your foot rises off the ground, a smooth ride when your foot is moving forward and cushioning at ground contact. Traction, Created With Data A waffle outsole was created using runner-informed data for traction where you need it. This info also helped guide the design and look of the shoe's sidewalls.