The bacteriostatic top fabric is fire resistant, fluidproof, tear resistant, cleanable, and replaceable. The patented Geo-Matt style foam topper is a high density, medical grade foam. The unique geometric design consists of over 800 individual cells, each of which acts individually to redistribute pressure, to reduce heat and moisture buildup on the skin, and to reduce shear to underlying tissues. This foam topper is 2 inches in height and includes the unique Heel Slope feature, designed to further reduce pressure for the sensitive heel area. Heel slope reduces pressure on heels with a subtle taper design that redistributes pressure onto the more load-tolerant calves. Beneath the Geo-Matt top, the core is made of three progressively denser premium foam layers of high resiliency foam. The layers deflect in stages, allowing the Atlas to accommodate the widest possible range of weights and still remain comfortable. Certified conformance to NFPA 101 (Life Safety Code); Cal Tech Bulletin #117; 16 CFR Parts 1632 and 1633; and BFD IX-11.