QUESTION: HI, I would like to know of this product can be used on half of a king size bed or if it needs to be on its own twin or hospital bed to be used. Please give me a call or email back. I am looking for an overlay with alternating pressure for my husband. thanks you Anne slager ANSWER: Yes, it can be used on any types of beds as overlay on top of a mattress. It's size is equivalent to twin size or half of king size. For more discussions, options and details about the product, or to order the product, please click here For use in the prevention and treatment of decubitis ulcers, the overlay features three pillow top head bladders increase patient comfort. This alternating pressure mattress Mattress has 17 air bladders, 9 with laser cut low air loss function to increase patient comfort: helps keep the patient cool and speeds recovery. Easy to replace individual bladders. The Nylon/TPU cover material is heavy weight, water resistant, vapor permeable and machine washable to provide protection and comfort. The cover attaches to the mattress with snaps. Pump has LED indicators to identify normal/low pressure levels. 5" cells are constructed with Nylon/50% TPU material that is firm and heavy weight. CPR valves provide fast (20 second) release of air from the mattress. Nylon top cover included. 3 cell pillow function. Quick fill adapter standard. Spring lined air tubes prevent kinks and disruption in air pressure. 1 year warranty on pump and mattress. The Controller Power: 110V / 60Hz Air Volume: 8 LPM Size: 8.88" W x 3.3" D x 11" H Cycle Time: 10 min Pressure Range: 20 - 80 mmHg Power Cord: 10 feet The Mattress Size (inflated): 80" L x 36" W x 5" H Weight Capacity: 300 lbs.