Dynaliner is the most effective automotive lightweight thermal insulator available, and perfect to use on topof Dynamat Xtreme. It is a soft, self-adhesive closed cell rubber with thousands of cells packed extremely closetogether, which gives the material near zero air infiltration occurrences. This is the key to its ability to reduceheat, as well as resist oil and water. Dynaliner is also durable enough to be crush and tear resistant.