My dealer gave us low-quality mattress pads and they began to sag and become undone at the halfway bend point, so I looked for the best I could buy, and thought surely Tempurpedic produced mattress pads would be aware of the bed adjustment issue. But unfortunately, their mattress pads don't fit either. They are good quality, but if they become undone when using the bed adjustment, they're just as bad as the cheap ones. Using your useful comments suggestions, this pad has changed my life, making it difficult to enjoy the pleasure of an elevated bed. Things I love about the pad - good quality. Things I don't love - everything else. Sad.