The sneakers that helped define street style are re-imagined with Crater Foam, weighing in with at least 20% recycled materials. The super-soft Crater Foam midsole is made from a spacey mix of approximately 11% Nike Grind rubber and foam materials. With a speckled outsole made from 15% Nike Grind rubber, each pair of the Nike Air Force 1 Crater is unique and durable.