Nike Free RN Flyknit Women Running Shoes features a newly designed midsole pattern that expands, flexes and contracts with your foot with every step. Its sock-like upper provides the incredible fit of Flyknit for total comfort throughout your run. Non-stretch heel material for added structure. Rounded heel for natural range of motion. Lightweight solid rubber segments under the toe and heel for enhanced traction and durability. Runs true to size. FABRIC