Aggg! I hate that. Believe it or not, I still sleep on a waterbed. So lifting the corners is a true ordeal (heavy!) And the stupid fitted sheets have microscopic corners to slip over the mattress corners. So they slip right back off every time you try to get them into place. I will never get another waterbed! Not a difficult promise to keep, since they haven't been exactly easy to find for, oh, about four decades now. We do still have one waterbed store left in Denver. But when I dump this mattress I'm going to take it out of the bedroom after trimming it to size with a Sawzall - so I'm won't be tempted again to just go get another waterbed mattress "so I don't waste this nice wood frame that is still good!" Screw that.