Abstract: The invention relates to a mattress, particularly an air mattress. It comprises a bottom element (1) and a number of elongated, bag-like mattress elements (2), which may be inflated with gas such as air and are adjacently attached in the bottom element (1) of the mattress, transversally to the lengthwise direction (D--D) of the mattress and in such a fashion that they form, when inflated with gas, loop-like members, resembling an overturned U-shape or the like in cross-section, and extending outwards from the bottom element. The mattress may also comprise a number of second elongated, air-inflatable or similar resilient bag-like mattress elements. In that case, the first mattress element is arranged to encompass, at least partly, the second mattress element.