Nike Free Run 2.0 - Boys' Grade SchoolThe Nike Free Run 2.0 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/outsole provides lightweight support and cushioning. Deep Nike Free sipes deliver flexibility for a barefoot-like ride. BRS 1000™ carbon rubber heel and environmentally preferred rubber give durability where needed. A Waffle® piston outsole enhances cushioning and response.