The Nike Flex Runner is built to be light and flexible to help you feel fast on your feet. The stretchy slip-on design has leather on the sides to create structure and support while you run. A flexible foam sole provides lightweight cushioning. Stretchy, breathable fabric has a slip-on design that feels comfortable. Leather sides with elastic straps help secure your foot. Sole material: Rubber Outer material: Synthetic Inner material: Synthetic Closure type: Hook & Loop Size 12C Good pre owned condition