Condition: 100% Brand New_x000D_ Item Type: Back Correction Belt_x000D_ Color: Black_x000D_ Scope of Application: Chest backward hunchback, straighten back & beautify back, cervical spine pain_x000D_ Function: Ergonomic designs, relieve back pain, open shoulder and straighten back, improve hunchback_x000D_ Applicable People: Children / Adults Unisex_x000D_ Optional Size: XS, S, M, L, XL, 2XL, 3XL, 4XL, 5XL_x000D_ Wear Process:_x000D_ The First Week: The adjustment period, should not be too tight, let the back adapt first._x000D_ The Second Week: The retention period, adjust the tightness a little to let the back get used to it._x000D_ The Third Week: The adaptation period, it is recommended to wear it for about 2 hours every day._x000D_ Size Chart:_x000D_ SizeLengthHeight_x000D_ XS86cm / 33.9in45cm / 17.7in_x000D_ S98cm / 38.6in45cm / 17.7in_x000D_ M100cm / 39.4in45cm / 17.7in_x000D_ L102cm / 40.2in45cm / 17.7in_x000D_ XL104cm / 40.9in45cm / 17.7in_x000D_ 2XL106cm / 41.7in45cm / 17.7in_x000D_ 3XL108cm / 42.5in45cm / 17.7in_x000D_ 4XL110cm / 43.3in45cm / 17.7in_x000D_ 5XL115cm / 45.3in45cm / 17.7in 1Force the shoulders to totally stretch, improve bad habits, and reduce the burden on the shoulders and cervical spine. 2Ergonomic designs, fits the spine better and reduces back pain. 3Hook&loop designs, easy to adjust the tightness, bring you convenience. 4Maintain natural straightness and relieve muscle fatigue caused by poor posture. 5Provides support for the shoulders and back, helps prevent hunchback and spinal curvature, and maintains proper sitting, standing, and walking posture.1 x Back Correction Belt