Therapeutic Foam Mattress Pre-Vent II Supreme Tri-Laminate Design Perfectly matched Med-Flex™ PPF™ foams throughout all layers Fully automatic, totally zoned mattress surface Pressure-redistribution Reflect™ SCT™ design top layer Exclusive Middle layer pressure-redistribution Multi-Flex™ PPF™ design Exclusive Heel Wrap™ PPF™ foam with Sphere™ design in top layer for maximum prevention of heel ulcers High density Med-Flex™ PPF™ foam bottom layer Vyvex II™ Low shear nylon, fluid proof top cover Barrier Lok™ control system All Med-Flex™ PPF™ foams and cover materials are fire retardant 7 year non-prorated warranty Cover: 4-way stretch urethane coated fabric with a low moisture vapor transmission rate (MVTR). Fluid proof , low-shear, low-friction protection, fire retardant, stain resistant and washable. The Barrier Lok™ ensures that standards are maintained,