Height and weight. Ten years ago, the average mattress size was 8 to 10 inches thick. Now, with the popularity of pillow-top mattresses, the thickness ranges between 10 to 14 inches. By making a no-flip mattress, only one side of the mattress is padded, which decreases the height. Unfortunately, these types of mattresses don’t last as long. You can’t turn them over and use the opposite side. That’s why The Sleep Shop of Appleton still pads our mattresses on both sides to ensure the longest possible life. Of course, if you would prefer a no-flip mattress, we will build you one upon request.