Abstract: A mattress assembly is provided that includes a body supporting portion, one or more air bladders positioned beneath the body supporting portion, and a frame portion. The frame portion includes a bottom surface and a sidewall that collectively define a well for receiving the one or more air bladders. The sidewall of the frame portion is secured to the second surface of the body supporting portion at a foot portion of the mattress assembly, while the sidewall of the frame portion and the body supporting portion are configured to move relative to one another at a head portion and a middle portion of the mattress assembly to thereby allow the mattress assembly to conform to the shape of an adjustable foundation.