Gel Mattress OverlayIncorporates a series of gel bladders encapsulated between high density polyurethane foam Therapeutically advanced yet cost effective support surface Fluid proof polyurethane coated nylon cover is durable, antibacterial, anti fungal, and fully unzips for easy cleaning A seal down the middle of each bladder that prevents gel pooling and gel migration Lightweight gel formula reduces overall product weight Four elastic straps secure the corners snugly to