Headsets on bicycles, particularly those without fenders, are exposed to water and grit thrown off by the front tire, which causes rust and rapid wear. Better headsets use rubber lip seals or "O" rings (dirt skirt) to try to keep water out, with varying degrees of success. External Neoprene bands with a Velcro fastening are available to wrap and protect the lower race, and are removable for cleaning. Some cyclists remove the fork and reassemble with a section of old inner tube over the lower race, which performs the same function, albeit with less convenience.