With supportive cushioning built for a smooth run, the Nike 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 to Nike React foam, to help you stay fresh and bouncy. (What's more? Nike ReactX reduces its carbon footprint in a pair of midsoles by at least 43% compared with Nike React foam. It's the kind of shoe that supports every step in style. *The carbon footprint of ReactX is based on a cradle-to-gate assessment reviewed by PRé Sustainability B.V. and Intertek China. Other midsole components such as airbags, plates or other foam formulations were not considered.