The Geo-Matt Therapeutic Overlay With Cover has a vinyl/nylon cover with antibacterial agent built in. This mattress is ideal for pressure ulcer prevention in moderate to high risk patients. Its proven effective in prevention and healing. The top surface is cut using patented Geo-Matt design, which creates more than 800 individually responsive foam cells anatomically sized to area of the body. The independent foam segments address pressure and shear and 'Ring-of-Air' channels minimize heat and moisture.