Nike Free 4.0 Flyknit Women's Running Shoes, 7, Hypr Trq/Blk/Prsn Vlt/Elctrc G Textile Rubber sole 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