We were desperate to find something, anything to keep these sheets in place. I was even trying to figure out what I could sew to the corners, like elastic straps, that might keep the sheets in place. I did a lot of research and read review after review. I decided to take a chance on these. We've used them for 3 nights, now, and the sheets remain in place! I have to admit I was a bit skeptical when I looked at the pieces and didn't have much faith that they would do the trick, but they do. So far...