This invention is directed to a mattress assembly for use in a sofa
sleeper. The mattress assembly has an outer shell and an inner support
received within the outer shell. The shell includes a lower panel, a
sidewall, and a cover that fit together to form a cavity to receive the
inner support. The inner support includes an air bladder and an
innerspring portion. The air bladder has a valve that is adapted to allow
air into and out of the bladder. The air bladder is deflated when the
mattress is stored to provide a compact configuration.