The Nike Free Express makes running a breeze with its lightweight wear and breathable fit. No-sew skin bonds to the mesh upper creating a seamless one-piece upper that moves with each stride, while the laser perforations are strategically placed for support and breathability. Pull tab on the heel for easy on and off. Flex grooves along the length and width of the Phylite midsole enhance range of motion and stability. Abrasion-resistant BRS 100 carbon rubber under the heel enhances durability. Waffle pistons in the outsole work with the Phylite midsole by helping to absorb impact for added comfort.