I had a heated mattress pad for years and loved it, crawling into a warm bed at night when the Michigan winters can be so bitterly cold. I was very disappointed when we went to purchase our new theripedic mattress that relies on your body heat to conform to support you individually. The sales lady told me you should not use the heated pads on the mattress. I have found the best price on the pad are at Sears and even better when they have their winter white sales.