CareGuard APP Alteating Pressure Pad System, 118" x 34" x 2-1/2", 160HZ, 10'' L x 6'' W, 4'' Thick Pump, Includes Flaps that Wrap Around Mattress for Better Stability, 250 lb. Weight Capacity Invacare offers two static overlays to aid in the prevention of pressure ulcers for those patients who are at risk of developing a pressure ulcer. The Invacare Gel Overlay and Invacare CareGuard Alteating Pressure Pad System are designed to be placed overtop an existing mattress. The overlays are both easy to use and maintain. 30 Days (Mattress) 1 Year(Power Unit) Warranty.