With supportive cushioning built for a smooth run, the Nike Infinity Run 4 women's running shoes are made with ReactX foam, which gives you energy return to help you stay fresh and bouncy, coupled with a Flyknit upper so you can feel confident in every stride with soft support and breathability. Also, the curved outsole helps your foot rock smoothly from heel to toe and through your stride to foot strike. It makes every step feel more natural and adds efficiency to your run, helping you waste less energy as you hit your stride. These running shoes are the kinds of shoes that support every step in style.