Designed for those at medium to high risk of developing pressure ulcers, the versatile Domus 3 Dynamic Mattress can be either an overlay or a full replacement with the addition of a 76mm (3\") foam underlay which can be placed into the integrated pocket in the mattress base.The static mode gives constant low-pressure therapy while the alternating mode mimics sleep movement patterns by increasing and decreasing cells. The Micro Low Air Loss feature helps to reduce humidity and maintain the user\'s skin temperature at a comfortable level. An alarm alerts caregivers if there is a loss of air pressure, and the mattress is supplied with a 2-way stretch vapour permeable cover that is easy to clean. The bed is not included.