Pressure relieving mattress

A pressure relieving mattress comprising:

• an elongate support having a base and a pair of spaced longitudinal side walls, the base providing a base surface extending between the side walls;
• a pressure relieving overlay overlaying the base surface;
• and
• an inflatable inlay which extends between the base surface and the overlay, and which comprises a plurality of laterally extending inflatable cells that define an inflatable volume with a first end, a mid portion, and a second end, each cell comprising a grommet disposed at the first and second end thereof, one of the grommets being open to define a passage into the cell and the other grommet being closed, wherein adjacent cells comprise open and closed grommets at alternate ends thereof, and
• wherein at least one of the inflatable volumes is wider adjacent its ends than in its mid portion in an un-inflated state,
• the pressure relieving mattress further comprising a first supply extending longitudinally along the mattress within a first recess, below the base surface, and a second supply extending longitudinally along the mattress within a second recess, below the base surface, and which is separate from the first recess, the first and second supply supplying alternate cells of the plurality of laterally extending inflatable cells.