Stop Vibrating Sheet Metal and Road Noise! 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 body panels. The aluminum constraining layer is very moldable and conforms easily to all interior surfaces. The patented extra sticky butyl layer is formulated with VECTOR™ chemistry for the most amazing energy conversion capabilities ever. Use it on your doors, floor, roof, rear door and bulkhead for a quiet, cool and incredibly solid ride.