LIGHTWEIGHT AND FLEXIBLE. The Nike Flex Runner Sport is built to be light and flexible. The stretchy slip-on design has leather on the sides for structure and support. A flexible foam sole provides lightweight cushioning. Lightweight Comfort: The slip-on design is made of fabric that stretches to let your foot move comfortably. Strappy Support: Elastic straps across the top of the foot and behind the heel help keep you secure. Flexible Cushioning: grooves in the sole make it flexible to flex with your foot while your run, and soft foam cushions your step. More Details: cushioning around the ankle. Pull tabs at the heel and tongue.
Upper - Textile, Lining and Sock - Textile, Sole - Other Materials.