Thank you for viewing. This is a NIKE Alphafly 3 Prototype, size 26.0cm. The Nike Alphafly 3 "Prototype" color features a thicker ZoomX foam midsole, providing lightweight yet excellent cushioning for long distances. On the outer side of the midsole, the athlete's number during testing (20820-4) is inscribed in honor of the runners who participated in the wear tests, representing Nike's development process that was refined through testing with athletes. The running distance of this product is unknown. There is some wear on the soles and a slight feeling of use. There are no air leaks. Overall, there are minor scuffs and light soiling, but it is in a clean condition without significant damage. *To prevent product substitution, returns and cancellations are not accepted after purchase. Thank you for your consideration.