Nike Women's React Infinity Run FK 2 Running Shoes Black Size 11.5 B(M) USDesigned to keep you going at any level this all distance running shoe sits on springy responsive React foam that turns every step into returned energy The breathable Flyknit upper sports integrated Flywire cables that anchor it to the sole with a dynamic flexible fit while rocker construction moves naturally through all the phases of a runner's stride for a smooth stable ride