I like the adjustable straps, they fit our smaller 4" mattresses.  Love the anti-skid backing, and they rose quickly with the help of a space heater (lucky for us because delivery was delayed and we didn't have the 24-48 hours before our guests arrived.) The sewing and material around the zipper was a little cheap and when the zipper got caught during setup, we almost ripped the cover but other than that they were just what we were looking for.