Just as racers use tire warmers to maintain tire temperatures between sessions, it's equally important to maintain stable fuel temperatures. Hot fuel results in less HP, increased fuel pump stress, and the increased risk of vapor lock. The DEI slip-on fuel tank cover is made pump stress, and the increased risk of vapor lock. The DEI slip-on fuel tank cover is made from a 2mm felt backed Mylar material and is capable of reflecting up to 90% of the sun's heat. This helps prevent the fuel in the tank from "baking in the sun" between green flags. Simply cinch the draw string and your bikes fuel will stay nice and cool between races. Elastic edges ensure a snug fit, no matter what brand you ride.