The MegaMat is Exped's original, most comfortable, best-reviewed sleeping mat, making truly luxurious sleep a reality for thousands of car campers and overland enthusiasts everywhere since its introduction in 2011. The MegaMat Duo 10 Queen has at its core 10 cm (4) of just-the-right density, Oeko-Tex 100 certified, open-cell polyurethane foam for support and warmth. Horizontal air channels in the foam help reduce weight and packed volume without sacrificing comfort. To enhance the cradling effect, like a high-end home-based bed, the mats surface features a brushed, stretch tricot polyester that relieves pressure points (hips and shoulders) while evenly supporting the body across all surfaces, head to foot. The MegaMat is self-inflating. 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. Inflate and deflate valves are large, high flow-rate FlatValves an EXPED firstovation (first-ever innovation). The inflate valve is equipped with a one-way flapper, allowing air to easily be purged during the night and with just the touch of a fingertip if you find the mat is too firm. Vertical 3-dimensional sidewalls allow the top surface to extend all the way out to the edge of the mat without tapering, maximizing the usable sleeping surface -- just like a bed at home.