Butyl Sound Deadening Foam Mat for Car Panels (330x660m)Combining both the sound deadening properties of butyl material, and insulating properties of honeycomb foam, this is an easy single application solution for complete sound deadening and isolation that also offers thermal insulation. Consisting of a layer of our AX 3687 Butyl Based sound deadener and a 3. 0mm thick layer of honeycomb foam (similar to our AX 3662), lining the cabin of your vehicle with these sound deadening sheets will give you