Rubber sole Style#: CD4371-002 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 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. 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 2 continues to help keep you running. A refreshed Flyknit upper uses Flywire technology for support and breathability where you need it. Higher foam provides soft responsiveness and long-lasting comfort, plus a wider forefoot helps lessen the chance of stress-related injuries. It's still one of our most tested shoes, designed to help you feel the potential when your foot hits the pavement.