Only used a few times. Like new in original box . DR-HO'S 2-in-1 Back Relief Belt has an outer belt that functions as a back support belt and an inflatable inner belt that expands vertically to decompress the lumbar spine. It becomes rigid after inflation to provide total back support while decompression pressure from the lower back. It comes with a high-capacity, arthritic-friendly hand pump. The Back Relief Belt can be used to while working, sitting or resting. To select the correct size, please measure waist size in inches around at the level of the belly button. Size A is for 25" - 41