THE APICO FILTER SKIN FITS DIRECTLY OVER YOUR BIKE'S AIR FILTER . AIR FILTER SKINS ARE A MUST FOR WHEN YOU'RE RIDING IN SAND OR DUSTY CONDITIONS. PREVENTING EXCESSIVE SAND OR DUST BEING SUCKED INTO YOUR FILTERWHEN REMOVED IT LEAVES YOU WITH A FRESH CLEAN AIR FILTER READY FOR YOUR NEXT RACE, SO YOU HAVE A CLEAN FILTER WITHOUT THE HASSLE OF CHANGING FILTERS BETWEEN MOTOS.