You're one of those athletes who run around the clock, challenging and encouraging each other to shatter goals. This must-have training shoe features a lighter, more breathable upper than our previous version without losing any of the strength and comfort to help you perform at your best and dominate your workouts. This version features a retractable heel that allows you to put it on without your hands and then snaps back into position to hold your foot in place, while the flexible heel retracts when you put it on and snaps back into place. Flexible and responsive, the Nike React foam provides comfortable, lightweight and dynamic cushioning when you engage in cardio workouts and sprints. Grippy rubber wraps the arch for intense rope climbs. The rubber outsole gives you optimal grip and stability when you go from the gym floor to the pavement. The flat, wide heel gains stability with an internal plate that distributes weight from edge to edge. It also moves with your foot for comfort during your cardio workouts and sprints. Lightweight mesh with textured reinforcements on wear areas to give you maximum coolness without losing strength. A tongue locks the laces with a Velcro closure to keep you out of the way. A heel clip keeps you from slipping when exercising against the wall. Grooves on the sole allow the forefoot to bend naturally.