l Children's Kyphosis Correction Belt, Back Sitting Correction Device, Male And Female Sitting Correction Belt AZ4461 Size: S--recommended weight 20-40KG, M--recommended weight 40-75KG, L--recommended weight 75-90KG.This humpback orthosis is comfortable and breathable, with elastic velcro and adjustable straps to adjust the size.Relieve back pain: often maintaining an incorrect sitting posture can cause neck or shoulder pain, back pain, osteoporosis, scoliosis, hunchback, and many other problems. This orthosis helps to correct, treat, assist and support postural correction plastic surgery problems.The weight is very light and fits the body very well, you can wear it under your clothes, you won't notice it.