Bought this to cover king sized mattress with memory foam toppers. In fact; also bought one for the queen sized mattress in our motor home. Even though my mattresses are very deep and comfortable; wanted a cover to hold topper in place and make bed more uniform in appearance. Could not ask for a better mattress pad for the money. Quality fabric and workmanship. The stretchy fabric on the sides makes it "an exactly right fit, for any mattress", that stays in place without any hassel..