Nike Men's Free 5.0 Black/Vlt/Dk Mgnt Gry/Smmt Wht Running Shoe 13 Men US Mesh Flywire technology for ultra-lightweight support Nike Free Phylite midsole doubles as an outsole for lightweight cushioning, durability and reduced weight Deep hexagonal flex grooves for a natural, barefoot-like ride No-sew overlays throughout provide support and durability without added weight