By utilizing abdominal pressure, you can effectively train your inner muscles and improve a protruding belly with less strain on your muscles. This will be surprisingly helpful for those with back pain or who work carrying heavy objects. The regular price is quite high at 29,800 yen, but this product is very popular and well-received by people with back pain. It's a stock item, and all our staff use it. Size L: Waist 89-102 cm