The updated Nike React Infinity Run takes up where the original left off. This is a soft, responsive everyday trainer that bridges categories to provide a shoe that is stable for both neutral runners and runners that spend more time in a pronated position. The major update is a knit upper (Fly Knit) that incorporates Flywire for a stable and secure lockdown around the foot. More padding in the heel collar also provides a more comfortable and secure fit. Other updates include more blown rubber on the outsole for for better traction and durability. Even though there is still a full-length midsole consisting of React foam, the formulation may have slightly changed. Wear-testers report that this version is slightly more responsive than the original React Infinity Run. The wide base and guide rails around the heel still provide unobtrusive stability. This can be a very comfortable shoe for all your training needs.