With supportive cushioning designed for a smooth ride, the Infinity RN 4 will get you moving. This road runner is made with soft, comfortable Nike ReactX foam and updated with Nike Running's best Flyknit yet. You'll be ready to go anywhere, anytime. It's the kind of shoe that gives you the priceless feeling of being able to run faster and further thanks to high foam stacks and an intuitive design that supports every step. Support for the planet ReactX foam reduces the midsole's carbon footprint by at least 43% compared to previous Nike React foams. As a result, it also supports the planet. Cushioning: Super strong The more cushioning you have underfoot, the softer and more comfortable the ride. The cushioning provides impact protection when your feet hit the ground. ReactX foam provides an incredibly supple feel so you can push your limits.