Bacteriostatically treated, anti-fungal, anti-static top fabric is fire-resistant, fluid-proof, tear-resistant, cleanable and replaceable and has ultra-low moisture vapor transmission (mvt) rate. Pleated design of top fabric allows full integration with the mattress's geo-matt style shear-relieving surface while minimizing hammocking. Geo-matt style foam topper is a high density, medical grade foam. Integrated side flap with velcro closure allows easy access to quick-connect ports. Other standard features include the exclusive heel slope taper and two-part safety-edge bolster system for added stability when sitting or transferring. These cylinders perform the alternating pressure therapy, Cylinders inflate and deflate in a fixed 10-minute cycle. Comfort Dial on the Control Unit changes pressures inside the cylinders within a small but perceptible range. FireGuard version conforms to 1997 NFPA 101 (Life Safety Code) and Cal 129.