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