A patient support 10 for a patient comprising: a bladder layer 12 of fluid pressurized bladders 20, the bladders 20 each having an upwardly facing surface for facing and supporting the patient; and wherein the bladders 20 are in fluid communication either directly or indirectly with surrounding bladders 20 and are configured such that if one or more bladders 20 are compressed by a part of the patient's body, the increase in pressure in the fluid in the compressed bladder or bladders 20 will be redistributed to the bladders 20 surrounding the compressed bladder or bladders 20, which in turn redistribute their increase in pressure to their surrounding bladders 20 so that the bladders 20 that surround the compressed bladder or bladders 20 will substantially retain their compressibility and stiffness and further will remain uncompressed and instead envelope that part of the patient's body to thereby distribute the weight of that part of the patients body over a greater contact area than just the facing surface of the bladder or bladders 20 that are compressed by that part of the body; said bladder layer 12 configured to allow air flow to flow from an air flow system through at least one sheet forming said fluid pressurized bladders 20 to facilitate moisture management; and a cover 19 over the fluid pressurized bladders 20, the cover 19 having an upwardly facing patient surface and a bladder layer 12 facing surface, the upwardly facing patient surface for forming a patient support surface on the support and forming a patient interface, and the bladder layer 12 facing surface lying on the upwardly facing surfaces of the bladders 20, and the cover 19 comprising a moisture vapor permeable, but generally liquid impermeable cover 19 to allow moisture vapor to flow through the cover 19 into a space beneath said cover 19 and above the bladder layer 12, wherein the bladder layer 12 forms a reservoir for the moisture vapor passing through the cover 19 and for air flow from an air flow system to direct moisture vapor to flow out of the cover 19 at a location other than the interface so that together the cover 19 and the bladder layer 12 will transport away moisture from the patient's body at the interface. a bladder layer 12 of fluid pressurized bladders 20, the bladders 20 each having an upwardly facing surface for facing and supporting the patient; and wherein the bladders 20 are in fluid communication either directly or indirectly with surrounding bladders 20 and are configured such that if one or more bladders 20 are compressed by a part of the patient's body, the increase in pressure in the fluid in the compressed bladder or bladders 20 will be redistributed to the bladders 20 surrounding the compressed bladder or bladders 20, which in turn redistribute their increase in pressure to their surrounding bladders 20 so that the bladders 20 that surround the compressed bladder or bladders 20 will substantially retain their compressibility and stiffness and further will remain uncompressed and instead envelope that part of the patient's body to thereby distribute the weight of that part of the patients body over a greater contact area than just the facing surface of the bladder or bladders 20 that are compressed by that part of the body; said bladder layer 12 configured to allow air flow to flow from an air flow system through at least one sheet forming said fluid pressurized bladders 20 to facilitate moisture management; and a cover 19 over the fluid pressurized bladders 20, the cover 19 having an upwardly facing patient surface and a bladder layer 12 facing surface, the upwardly facing patient surface for forming a patient support surface on the support and forming a patient interface, and the bladder layer 12 facing surface lying on the upwardly facing surfaces of the bladders 20, and the cover 19 comprising a moisture vapor permeable, but generally liquid impermeable cover 19 to allow moisture vapor to flow through the cover 19 into a space beneath said cover 19 and above the bladder layer 12, wherein the bladder layer 12 forms a reservoir for the moisture vapor passing through the cover 19 and for air flow from an air flow system to direct moisture vapor to flow out of the cover 19 at a location other than the interface so that together the cover 19 and the bladder layer 12 will transport away moisture from the patient's body at the interface.