The Crotton Turbo Med Girdle is designed for people with moderate low back problems. It can be used at any time of the day or worn for hours to relieve low back pain and aid in the recovery of the affected area. Size 3 is equivalent to an M or a circumference of 88 to 98 cm.. *For hygiene reasons, we do not accept returns for this product after it has been opened. It can only be returned if the seal is still intact and the packaging has not been manipulated.