Abstract: A mattress comprises a mattress body (2, 3, 14) made of a resilient material, such as foam rubber, and a covering (12) which is fixed to the mattress body (2, 3, 14), such as a moisture-impermeable covering. The mattress body has at least two adjoining mattress body sections (2, 3, 14) which have mutually facing boundary surfaces (4, 5; 6, 7), to which boundary surfaces (4, 5; 6, 7) a covering (12) is likewise fixedly fitted. The covering (12) of at least one (14) of the mattress body sections has a substantially airtight casing (15) which is connected to an air connection (17).