With Therm-a-Rest’s mighty MondoKing 3D mattress you’ll have an unbeatable night's sleep under the stars. Built with a StrataCore construction, it features a continuous layer of thermal foam sandwiched between alternating layers of air and foam. The result is 10cm of supportive cushioning and an outstanding warmth-to-weight ratio. Ensuring you sleep soundly, the plush stretch knit fabrics are soft next-to-skin while the vertical sidewalls maximise your sleeping area. So you can make the most of your snoozing time, the MondoKing 3D features a TwinLock Valve system to speed up inflation and deflation. Therm-a-Rest MondoKing 3D XXL Camping Mat - Marine Blue