Dynamat Xtreme is the highest efficiency sound deadening material available and the most effective product for stopping noise and vibration. Xtreme should be used on any and all interior sheet metal or fiberglass of your vehicle. The aluminum constraining layer is very moldable and conforms easily to all interior surfaces. The extra sticky patented butyl layer is formulated with VECTOR™ chemistry for the most amazing energy conversion capabilities ever. Use it on doors, floors, roofs, hoods and trunks for a really quiet, cool and incredibly solid ride.