mat66 problack 80 mil 36 sqft car sound deadening mat, butyl automotive sound deadener, vehicle audio sound insulation and dampening material mat 66 mat 66 problack 80 mil as a whole is a high quality sound deadening insulation. mat 66 problack 80 mil is light weighted automotive sound deadener! vibro-dampening layer is a composition of butyl and different improvers. these compounds have to be used in correct proportions so the maximum soundproofing efficiency is achieved. different weight of material may affect the physical properties that way decreasing the performance. mat 66 problack 80 mil sound deadening mat features high level of adhesion! mat 66 is easy to cut, install and it is overall a very user-friendly soundproofing material. mat 66 does really work! this insulation pads eliminate vibrations, reduce overall noise and rattle level of your auto thus allowing for higher comfort. mat 66 problack 80 mil does also improve a quality of your car stereo system. however, using mat 66 problack 80 mil as standalone will not be 100% solution to sound proof your vehicle while still making a sensible difference. we recommend using mat 66 problack 80 mil in combination with a layer of closed cell foam, which is a special heat and cool insulation material and additional noise barrier. please note! correct installation of material is 50 % of success in the process of car soundproofing. carefully roll down material to the degreased surface with the roller. special embossing on the foil is made for convenience of installation so you can see the areas that are properly rolled down and those one needing more pressure.