[Invisible Under Clothes]: This back brace can be worn invisibly under clothes which enables you wear it anywhere even in school; no more hunching, slouching or rolling the shoulders forward. [Three Sizes Fit Most Kids]: Adjustable and elastic belts separately on the shoulder and waist make this back brace fit different body shape; S fits 13¡±~24¡± in waist circumference, M fits 24¡±~32¡± in waist circumference, L fits 32¡±~42¡± in waist circumference. [Elastic and Comfortable Straps]: Features two strong elastic shoulder straps with protective shoulder pads and a adjustable lumbar belt, this back straightener posture corrector provides comfortable protection for your kid. [Two Metal Splints Provide Effective Support]: 2 metal plates inside the fabric are contoured along the axis of kid¡¯s upper back spinal; it provides strong strength and stability to upper back and works as a reminder to develop good back posture and avoid myopia. [Help Your Kid Build A Better Posture]: The back brace posture corrector is designed for kids and teenagers to prevent hunchback, kyphosis, lordosis, winged scapula, round shoulder ect; establishing a good posture in adolescence helps your kid grow healthily and confidently.