Nike ZoomX foam in the footbed delivers energy return as you move forward. A visible Zoom Air unit provides responsive cushioning, giving you an extra spring with your stride. The shoe’s heel collapses when you step in then snaps back into place. A lock-and-release mechanism secures the fit, eliminating the need to tie laces. Pull the loop near the tongue to tighten, and release by pulling the loop near the toe. Nike React technology at the heel is lightweight and durable. It helps keep your foot cushioned and secure with every step. The rubber outsole features a design created using data from hundreds of runners. That information helps place traction where your foot needs it most, giving you grip on multiple surfaces. The look of fast comes alive with a translucent, high-tenacity Flyknit and synthetic upper. Its secure feel helps contain your foot with every step. A midfoot cage provides extra support. Cushioned heel pods add comfort.