These are designed and work great on California King size wood frame waterbeds. One of the most common complaints about waterbed sheets that are only pocketed on the corners is that the sides of the sheets tend to come up and expose the vinyl mattress. With California King Waterbed "Fitted" sheets, there is always plenty of sheet to reach the bottom of the mattress. The elastic band also keeps the sheets from "riding up" and the corners will never pop off.
