Belt will fit 29 to 49 inch waists Decompression is a proven technique endorsed by medical professionals used in both upper and low back pain treatment, without the need for surgery or drugs. Just wrap the Decompression Belt firmly around your waist, attach the pump, and inflate the belt. As the belt inflates with air, it expands vertically, gently stretching and tractioning the lower back. This gentle traction helps decompress the spinal discs and stretch and relax tight muscles to relieve lower back pain. Because the Physio Belt fills with air, it is not bulky and very light, so you can wear this discreetly underneath your every day clothes. Wear it for just 30 minutes a day as a therapy belt. Or wear it all day while you work and play as an activity belt. You can even wear the Belt to get a restful night's sleep. The dual purpose of the Physio Belt allows you to not only get home physiotherapy, but also allows you to be active and do everything you've avoided. Treating chronic and acute back pain has never been easier. People of all ages and all sizes, from young athletes to seniors, are getting fast, long-lasting back pain relief with the Physio Belt. Remember, with the Physio Decompression Please refer to FAQ section for return policy on personal use type products