Rubber sole Style#: CW5245-100 The shape of the Nike React foam midsole provides support for the 3 phases of a runner's stride. It helps create flexibility at toe-off, a smooth ride at mid-stance and cushioning at contact. The black speckle is inspired by runners like you when kicking up asphalt while logging miles on those soft-gravel backroads. Less material in the shoe means you're closer to the foam, creating a softer, more responsive experience. Increased rubber at the outsole helps deliver traction and durability. The Nike React Infinity Run Flyknit is designed to help reduce injury and keep you on the run. More foam and improved upper details provide a secure and cushioned feel. Lace up and feel the potential, mile after mile.