Muscular back pain responds quickly to Thermotex treatment. Although the muscles of the back are large, they are fairly thin which allows for ease in deep penetration of infrared wavelengths into the body. This in turn helps to increase localized blood flow resulting in the relaxation of muscle groups and the relief from pain and inflammation. The Gold model provides the largest surface area (143 square inches) to treat the back. The Platinum is an excellent alternative if you suffer from pain in other areas besides the back.