Gravity 9 Premium Long Term Care Pressure Redistribution Mattress w/3 Elevated Perimeter and Cut-out is the ultimate in the industry for multi-layered die-cut foam and true memory foam, available with or without raised side rails. FeaturesMattress includes a 6 to 4 heel slope and a channel cut center layer of foam under the foot section to target heel ulcer prevention. Top layer is full-length open-cell visco-elastic memory foam. Bottom layer provides full length horizontally scored articulation cuts extending the durability and life of the mattress significantly. Cover is fire retardant, fluid proof, tear resistant, low sheer, and easy to clean. SpecificationsCover Material Fluid Resistant Nylon Top Waterproof Vinyl Bottom Mattress Layers of Foam 4 Layers Side Rails Yes Dedicated Heel Section Yes Weight Capacity 450 lbs Warranty 15 Year Limited Warranty Foam 1 Year Warranty Cover 1 Each / Each