The Gravity 9 Premium Pressure Redistribution Mattress features a high-end design that aids in your long term care needs. The Gravity 9 has three full layers of foam to maximize comfort and pressure redistribution. The top layer features full-length open-cell, visco-elastic memory foam, while the bottom layer has full-length, horizontally-scored articulation cuts, which assist in the mattress’ longevity. The Gravity 9 features a 6” to 4” heel slope and “channel cut” center layer of foam, which assists in heel ulcer prevention. The high-density foam perimeter assists with safe and easy transfers out of the mattress. The Gravity 9’s stretch cover features a low shear design which is fire retardant, fluid proof, tear resistant and a breeze to clean. The optional elevated perimeter and cut-outs have two benefits: The elevated perimeters help to keep the user from falling out of the bed, while the cut-outs assist the user in getting off the bed when transferring.