The Nike Free 4.0 Flykit offers a snug fit that conforms to the shape of your foot and extreme flexibility that allows it to move freely. One-piece Flyknit upper integrates with dynamic Flywire cables for a snug, sock-like fit that moves with your foot while offering both support and breathability. Hexagon flex grooves in the midsole allow a natural range of motion. 6mm heel-toe offset. Environmentally preferred rubber pods in high-wear areas of the outsole for durability and traction where you need it most. Wt. 7.8 oz.