Made of high density 10cm thick polyurethane foam, this double self-inflating mat offers great sleeping comfort at camping site. With anti-slip polyester pongee bottom and PVC coating, the mat is suitable for all ground surfaces. With joinable buttons on the sides, it allows you to join multiple mats together. Equipped with 2 efficient self-inflating valves at the end of the mat, it only takes 60 seconds to inflate. Ready in one minute!