The Boom Mat Moldable Barrier is a highly flexible .5lb/ft2 sound and moisture barrier designed for those applications where Under Carpet space is limited, and the need to have an acoustical noise barrier is desired. Conforms to the shape of your chassis, or for more intricate areas, can be molded with a heat gun. Even becomes quite flexible by simply warming the BM-MD outside on a sunny day. Can be installed as is, or used with a decoupler such as the Boom Mat Lite for increased acoustical efficiency, an important consideration especially in the firewall area, or to control exhaust noise in the cabin.