Twin Air Radiator Sleeves prevent mud, dirt and sand entering your machines radiators before it can build up causing overheating and eventually, damage your bike's engine. Easy to install - simply remove the radiator louvres and slide the sleeve with its elasticated fitment and pre-punched holes for the mounting pins over, before refitting the louvre. This breathable barrier of nylon-coated, glass yarn mesh allows dry dirt to simply fall off after build-up from the vibrations off your bike.