With supportive cushioning built for a smooth run, the Infinity 4 helps you hit the ground running. Made with soft, comfortable Nike ReactX foam for an added boost and updated with Nike Running's best-fitting Flyknit yet, this road runner helps you take off any time, anywhere without all that wear-and-tear attrition living rent-free in the back of your brain. It's the kind of shoe that can grant you that priceless peace of mind to go faster and further, thanks to high-rise foam stacks and an intuitive design that supports every stride.