The new Nike InfinityRN 4 are crafted with ReactX foam to deliver supportive cushioning for a responsive and smooth run - providing you with 13% more energy return than normal React foam. This added cushioning helps to support your stride, and push your limits with every run, softening the impact as your feet hit the ground. Made with a Flyknit band around the centre of your foot, to offer added support and a water-repellant liner in the toe to keep them dry if the weather turns. Traction is added through the waffle outsole, made with rubber for increased durability.