Nike ReactX Infinity Run 4 - Men'sWith supportive cushioning built for a smooth run, the InfinityRN 4 is a brand new take on a familiar favourite. It's made from our all new Nike ReactX foam, which gives you 13% more energy return compared with Nike React foam, to help you stay fresh and bouncy. (What's more? Nike ReactX reduces the carbon footprint of the midsole by at least 43% compared with Nike React foam, so it helps support the planet, too). We coupled the ReactX foam with Nike