Rubber sole Style#: CW5636-100 Higher foam stack heights provide a softer feel. A wider shape provides a more stable ride, helping release energy with every step. The shape of the Nike React foam midsole is all about zonal performance. Less material between the insole and the midsole 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.