Nike and triathlete Sarah Reinersten have teamed up to develop a rubber sole that fits over Ossur’s ‘flex-run’ prosthetic running blade. Sarah Reinersten is the first woman on a prosthetic leg to finish the Ironman World Championships. The Nike Sole is designed in a way that makes it easy to place and remove from the prosthetic blade. The sole is supposed to increase stability, normalize stride length and improve forward energy return for a more efficient gait progression. This is pretty cool!