1. Posture Correct - Our posture corrector is made with humanized design, give you the proper compression to you back and waist which is so helpful to prevent humpback or posture correction, helping you stand taller and straighter. 2. Suitable For All Genders - The whole family can benefit from this posture corrector that is fully adjustable and designed to fit all genders. Effectively get rid of shoulder, back, and neck pain from sprains, muscle spasms, and strains. 3. Body shaping-This back brace also can be used to shape your body freely according to your own conditions, which makes you look more slim, long time use even can lose your fat of abdomen, it is light weight and thin, Invisible can be worn as underwear. 4. Made of breathable velvet fabric, aluminum alloy holder with good plasticity, easy to wear. Detachable soft chest pad makes you more comfortable, easy to clean. 5. ""BACKPACK"" design-with humanized backpack design, does not affect chest and abdominal breathing, no limiting to the motion of the shoulder and hands. Size Chart: S- -Suit for waist: 51-79cm or 20-31inch, Suit for height: 140-160cm or 55-63inch M- -Suit for waist: 79-99cm or 31-39inch, Suit for height: 160-175cm or 63-69inch L- -Suit for waist: 94-104cm or 37-41inch, Suit for height: 175-185cm or 69-73inch