Castelli aero race mr shoecoveryou will see the castelli aero race mr shoecover on pro riders when they want to go fast the pattern is the result of cfd modelling and wind tunnel testing to minimise drag in this turbulent area of the body featurescreated using cfd computer modellingsmooth fronttextured aero mesh aids smooth air separation silicone leg grippercamlock zipperbuycastelli clothingfrom chain reaction cycles the worlds largest online bike store