Ssk-Wavy 315Mil/8Mm Lightweight Closed Cell Foam Mat – 32.3 Sqft. Vibration Damp Ssk-Wavy 315Mil/8Mm Lightweight Closed Cell Foam Mat – 32.3 Sqft. Vibration Dampening and Sound Deadening. Wavy foam can help dampen the surrounding noise, making it easier to hear and understand conversations within the car.