A semi waveless waterbed mattress contains one to two layers of wave reducing fiber. The fiber provides approximately 60% motion reduction for those that want less motion than a free flow waterbed but do not want to choose waveless support. A semi waveless waterbed allows for 8-10 seconds of movement. Add more or less water to control the firmness level so you can enjoy nearly perfect body alignment and better sleep night after night. Since your body consists of over 90% water why not also sleep in a pressure free and nearly weightless environment that virtually eliminates muscle tension. Add a hard-side waterbed heater to precisely regulate the water temperature and enjoy the deepest most rejuvenating sleep you have ever dreamed of. For use in a traditional hard-side wooden box frame.