If you want only a mattress you should use this one Neil or you will get the wrong device!!!
14. Basic bed mattress
Categories: 05 Hospital hardware , 11 Assistive products for persons with disability
Basic bed mattress P A large, durable, fabric case filled with a resilient material designed to be placed on a bed mattress support platform to provide a comfortable surface on which an occupant can lie and rest/sleep. The device provides no special therapeutic effect.