You can make them in three separate sections, which can overlap so that they adjust to different sizes of beds. They have a flat piece of fabric sewn along the top (a strip about 4-5 inches wide. That gets attached to the box spring with cork screw upholstery pins. A package of 30 was plenty for a queen size bed. Once it's in that way it stays exactly where you put it until you take the pins out. I didn't make the bed skirt that I did this for, but adapted a king size to fit a queen, and it worked great. That's the only way I'll attach a bed skirt from now on. Even the ones with a full platform tend to inch over from one side to the other and would benefit from having a few of those pins holding them down.