The Nike Flex Run 2021 keeps you comfortable in a lightweight, minimal design made of at least 20% recycled content by weight. It has a stretchy, adaptable fit and the flexibility you want for a natural feel as you hit your groove. The shoe has stretchy fabric and mesh above the toes to conform to the foot. Grooves on the sole allow for flexibility and natural motion. Durable foam cushions the foot as it hits the ground. It is lace up, low top and athletic.