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.

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There are things that are known and there are things that are unknown. In-between there are doors.