Coopercare Lastrap for the back is designed to what doctors recommend most often. It rests your back while you stay active, out of bed. Coopercare will relax your lower back muscles and reduce or eliminate stiffness while giving gentle support to your back and abdominal muscles. All Coopercare Lastrap products use THERMOVIBE technology designed by Prof. Anthony Last, a world renowned research scientist. This technology allows the products to efficiently absorb damaging vibrations. At the same time natural body heat is directed into the muscles to keep them warm and stimulate blood flow. All Coopercare products are scientifically designed to offer not only relief to pain but also good protection against further or recurring injuries. Sizes available: Small, Medium, Large, X-Large