The Nike Free Run 2 running shoe features a breathable mesh, multi-layer upper that offers a lightweight, second-skin-like fit. Off center lacing and full innersleeve add plush comfort. Sculpted Phylite midsole provides lightweight support and cushioning. Deep Nike Free sipes deliver flexibility for a barefootlike ride. BRS 1000 carbon rubber heel and environmentally preferred rubber give durability where needed. A Waffle piston outsole enhances cushioning and response.