The waterbed has come a long way since it's original design, made from goatskin, which was invented in the 17th century. But the full motion, or free flow watermattress as we now know it, has changed little in the last 30 or so years. Our full motion mattresses are as well-made as our waveless mattresses, and have the same t-corner construction.If you like to rock-n-roll, this one is for you.Our best value with Free shipping!