http://www.firheat.com/back-pain-relief Not all heat pads for back pain are created equal. Each one uses different materials, heating elements and processes to provide heat for pain relief. Hence, its efficacy and effectiveness vary. There are so many heat pads and thermal wraps available in the market and online that choosing the best one can be confusing. http://www.firheat.com/back-pain-relief heat for pain relief, Microwaveable Heat Pads, Air Activated Heat Pads, Moist Heat Pads, Far Infrared Ray (FIR)Heat Therapy Wrap, infrared heat therapy, effective pain relief http://knol.google.com/k/carinn-ashley/-/3748rts7z3h0r/0#