MegaMat Auto is the ultimate vehicle sleeping pad. Like other sleeping mats in the MegaMat product line, the MegaMat Auto features 4 inches of open-cell polyurethane foam for support and warmth and a brushed, stretch tricot nylon surface for cradling comfort. The open-cell foam is self-inflating, meaning that when the inflate valve is opened, the foam expands and draws air into the mat. An EXPED Mini Pump is included to top-off the inflation and achieve the preferred firmness. Separate one-way inflate and deflate valves mean that air can easily be purged in the middle of the night for in-the-moment firmness adjustments.