Features： 1、Lightweight shoulder strap, good elasticity, easy to adjust and pull without deformation. 2、Strong hook&loop, no pilling, good stickiness, convenient and practical. 3、Fits the body's physiological curve, the posture correction and shaping experience is more balanced, stable and comfortable. 4、Adjust the oblique shoulder, shoulder wrapping designs, form a shoulder protection net, balances the shoulder pressure. 5、Powerful spine memory support shaping board, relieve fatigue and discomfort of shoulder, neck, waist and back. 6、Stretch crossed?leading belt, apply comprehensive backward force to stretch from shoulder and underarm, open shoulder, straighten chest and back. Specification： Item Type: Hunchback Correction Belt Color: Gray+Blue Scope of Application: Chest backward and hunchback, straighten back, cervical spine pain Optional Size: S, M, L Size Chart: SizeSuitable UnderbustSuitable HeightSuitable Weight(kg) S71-80cm / 28-31.5in150-160cm / 59.1-63in45-55kg M81-91cm / 31.9-35.8in155-170cm / 61-66.9in55-70kg L91-111cm / 35.8-43.7in165-180cm / 65-70.9in70-80kg Correction 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. Package List： 1 x Back Correction Belt 1 x Manual