Meridian Ultra-Care 4500 Excel Alternating Pressure/Low Air Loss Mattress System, includes 80 x 35.5 x 8"matress with 5" nylon/polyurethane air cells and 3" foam base, quilted vapor permeable nylon cover and 8 liter-per-minute pump, 10 minute cycle time, static or alternating therapy modes. Adjustable pressure range from 20 mmHg - 70 mmHg. 325 lb. weight capacity.