Optimize aerodynamics with RaceAero II shoe covers. It is a very thin cover that fits tight around the shoe and ensures a good aerodynamics. They are very elastic in the calf, so they sit close together and stay aerodynamic. A hole has been made for the cleats in the forefoot, and the covers can be used with all cleats. At the back there is a YKK zipper so you can take the cover off and on. The cover is one size to fit all shoes.