Dynamat 11101 3mm "Dynaliner" High Performance Insulation MattingGet Better Sound, Hear More Sound, Get Better Bass! Dynaliner is the most effective automotive lightweight thermal insulator available, and perfect to use on top of Dynamat Xtreme. It is a soft, self adhesive closed cell rubber with thousands of cells packed extremely close together, which gives the material near zero air infiltration occurrences. This is the key to its ability to reduce heat, as well as resist oil and water. Since it will not hold