The Ortho-Coil from Drive and Mason Medical offers the ultimate in super firm support in an innerspring mattress with two polyester fiber pads-perfect for heavier patients-and an anti-microbial, water resistant surface. Super-firm innerspring mattress provides ultimate support and comfort|The two polyester fiber pads on the top and bottom of the mattress are perfect for heavier patients|The Masongard vinyl waterproof cover is anti-microbial/anti-bacterial|The mattress is fire-retardant and conforms to CFR 16 part 1633