NO PRESCRIPTION REQUIRED: Same ThermoActive technology of our medical line, but adapted for consumer use for back pain. Included air pump provides precision Compression Therapy adjustments.nHELPS ACCELERATE RECOVERY from injuries while delivering targeted relief from pain for the back.nSIZING: Fits backs up to 46u0026#34; in circumference or up to 66u0026#34; with the included pair of extender straps.nHOT OR COLD THERAPY: Either heat in microwave or chill in freezer or refrigerator, depending on the stage of your recovery.nIncludes one support, one compression air pump, one pair of extender straps, and one removable hot/cold gel pack. Washable u0026amp; reusable.n