Specification: Gender:Male Female Used for:back support Material:breathable,elastic,thin Posture correction brace:spine brace Suitable for:work,walk,exercise and relax Suitable for the crowd:teenagers,adults Waist circumference: XS 65-80cm, S 80-95cm, M 82-99cm, L 84-103cm, XL 86-107cm, XXL 88-110cm, 3XL 90-112cm, 4XL 92-114cm, 5XL 100-120cm Instructions for use: 1)Untie all Velcro straps that may be stuck together. 2)Put the posture corrector on your back and put each arm through the corresponding shoulder strap,just like carrying a backpack. 3)Lean forward slightly,leaning the stand against your back.Place the vertical supports evenly on each side of the spine and make sure they lie flat on your back. 4)Fasten the large elastic waistband on the front.Make sure not to overtighten. 5)Sit up in the correct posture,tighten the shoulder straps,and fasten it to the large elastic waist belt with Velcro.Make sure that the two shoulder straps are evenly distributed. 6)Pull and fix the smaller waistband to provide additional support and increased comfort The package includes: 1*Posture corrector Note:Due to manual measurement,please allow an error of 1-2cm Choose waist size:XS 65-80cm,S 80-95cm,M 82-99cm,L 84-103cm,XL 86-107cm,XXL 88-110cm,3XL 90-112cm,4XL 92-114cm,5XL 100-120cm. Strong support and more effective:The back posture corrector has 2 support bars on the back to ensure stability and provide strong support to improve your posture. Relieve pain:It can reduce the pressure on key parts by adjusting the posture correctly,thereby alleviating the pain of the back,neck,shoulders and clavicle. Straighten your back:It can also train your back and shoulders,stretch your chest and shoulders back,and enhance your confidence Innovative design:The posture corrector uses two adjustable shoulder straps on your chest and waist to avoid cutting into your underarms and minimize the risk of underarm bruising.