QUESTION: While using the 2 Primary Care mattresses ( the APP and the low air loss type )are the use of breathable chux required for both types ? What would happen if you used regular chux ? ANSWER: You can use either of them. You can also use bed sheet (such as disposable bed sheet) too. Both systems include a quilted, breathable, anti-shear, water resistant top cover. So even without chux or sheet, the mattress also works and works even better for pressure relief function. For more discussions, options and details about the product, or to order the product, please click here The PrimaryCare Pressure Relief Mattresses deliver quality pressure wound treatment with a prospective price. Using leading-edge technology and materials, the PrimaryCare is engineered to insure quiet, reliable operation that won't fail you or your patient for prevent and heal early stage pressure sores. Shipping is free. There are two affordable PrimaryCare systems to choose from: Alternating Pressure Relief or Low Air Loss. The Primary Care Mattress system consists of 20 air cells. Pressure sensor technology insures a consistent, accurate desired amount of pressure. Both systems are customizable for individual patient needs - just by seeing patient weight. Alternating Pressure Relief provides complete deflation of every other air cell on a 5 minute cycle. Low Air Loss system features a series of low air loss vent hoses, and allows for adjustable rate of airflow. Both systems include a quilted, breathable, anti-shear, water resistant top cover. Rapid deflate CPR pull conveniently located at the head of the mattress to aid in quick rescues. Energy efficient - equivalent to less than that of a 25-watt bulb. Lightweight, service-free. Foam mattress integrated beneath air cells. Flexible straps to secure to any bedframe. Zippered, sealed design. Warranty: 2 years on compressor 1 year on electronics 1 year on softgoods The Controller Power: 110V/60Hz, 0.25 Amps Weight: 6 lbs. Size: 8" W x 3-1/2" D x 7-1/2" H   Mattress - Alternating Pressure Relief or Low Air Loss Size: 80" x 36" x 5-1/4" inflated Air Cells: 20 Weight Capacity: 280 lbs.