INCREASE SPL * IMPROVE BASS QUALITY * REDUCE BASS DISTORTION DYNAMAT is the easiest, thinnest and lightest product available for adding soundpressure reinforcement to your car. When the panels don?t vibrate, you get HIGHER SPL? as well as tighter, louder bass! Dynamat Xtreme provides as much as 5 times the damping efficiency of other brands. Xtreme requires ?no heat? for an easy moldable installation. It is so sticky that it bonds permanently without adhesive. The high-tech aluminum skin reflects radiant energy.