Fixing Your Posture has never been Easier! Main Features: ✅Correct hunchback: This corrector can correct hunchback. Humpback not only affects a person's physical beauty, but also stretches ligaments in front of your chest and affects respiratory function, which can easily induce myocardial infarction, syncope, and asthma. ✅Improve back posture: high-elastic restraint straps, shoulder straps and abdominal straps are each integrated and cross-wrapped to balance stress points and fit body shape. 2 hours a day to adjust golden angle, 63° normal curve comfortable spine angle, correct posture. ✅Powerful high elastic shoulder strap: enlarge force area and reduce local pressure. One-piece adjustment patch, wrap around shoulder guard. ✅Soft and thin: This correction belt can be worn inside, allowing you to straighten your back at all times and face life in a correct and elegant posture. Specifications: Material: PU, sponge. Function: Bone Care. Size Chart: S (for child): Chest size: 46 - 68 cm / 18 - 26 inch M (for teenager): Chest size: 68 - 91 cm / 27 - 36 inch L (for women): Chest size: 91 - 119 cm / 36 - 47 inch XL (for men): Chest size: 119 - 150 cm / 47 - 59 inch