The 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-repellent 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. These shoes are designed for maximum comfort and stability, targeting runners seeking a reliable shoe for daily training and longer road runs. The pronounced cushioning and stability features make the shoe ideal for those logging daily kilometers or seeking extra comfort for walking. The wide base, supportive midsole, and secure fit band help reduce unwanted foot movement and provide confidence for those with mild pronation or previous injury concerns. The shoe is also designed with extra toe room to accommodate different foot shapes and prevent discomfort on longer runs. The upper is made of Flyknit textile for breathability, stretch, and support. The internal Flyknit fit band provides secure midfoot lock-down. The midsole features Nike ReactX foam for high shock absorption, responsiveness, and sustainability. The injection molding process is used to minimize environmental impact. The outsole is a waffle-patterned rubber for durable traction on roads and tracks. Some versions employ strategically placed blown rubber for grip and weight savings.