Note: 1. It should not be too tight for first 3 days, and tightness should be moderate. Starting from 1-2 hours, gradually strengthen strength until it is suitable, and initially develop wearing habit. _x000D_2. Increase tension appropriately and stick to it every day [wear for 2 hours for 21 days to correct bad posture. specification: _x000D_Item Type: Back Brace_x000D_Material: Nylon/Nano Bamboo Charcoal + Aluminum Strip_x000D_Features:_x000D_1. Three aluminum plates are fixed, and middle of two detachable aluminum plates is not removable, which can better support and correct back, and posture is upright and body shape is better._x000D_2. The high-light, high-elastic breathable mesh fabric is light, soft, comfortable, moisture-wicking, and breathable._x000D_With integrated molding process, back, waist, and shoulder breathability points are increased, and wear is not tight, protects spine, is compatible with skin, and allows body to enjoy a more comfortable posture correction process every day._x000D_Scope of application:_x000D_1. Adolescents have poor sitting, standing and walking posture to prevent habit of bending over and lowering their heads, hunched back and close eyes habit_x000D_2. Relieve low back pain caused by standing for a long time, sitting at desk for a long time, maintaining same posture for too long, etc._x000D_Instructions:_x000D_Step 1: Stretch out your arms and put on adjustment shoulder straps to right position._x000D_Step 2: Pull down and level, adjust position of abdomen, and glue rough surface of abdomen._x000D_Step 3: Pull end of double Y cross-leader to abdomen, adjust tension properly and glue it._x000D_Step 4: After sticking two adjusting straps, raise your head and back straight, slim!_x000D_When using this product, try to straighten your waist and back, wear this product flat on your body, compact hook and wool surfaces of sticky buckle, and pull end of double Y cross strap to shoulder to adjust to maximum Good position, stick protective buckle well to achieve best pulling effect._x000D_Suitable CrowdedSizeWristShoulderHeightWeight_x000D_ChildS31.5cm / 12.4in54-62cm / 21.3-24.4in105-130cm / 41.3-51.2in0-27cm / 0-10.6in_x000D_ChildM37cm / 14.6in60-75cm / 23.6-29.5in130-150cm / 51.2-59.1in33-46cm / 13-18.1in_x000D_ChildL40cm / 15.7in70-80cm / 27.6-31.5in140-160cm / 55.1-63in40-50cm / 15.7-19.7in_x000D_AdultXL46cm / 18.1in90-100cm / 35.4-39.4in160-180cm / 63-70.9in55-73cm / 21.7-28.7in_x000D_AdultXXL46cm / 18.1in100-140cm / 39.4-55.1in175-190cm / 68.9-74.8in73-88cm / 28.7-34.6in Features: 1Three elastic aluminum plates strengthen and support back, long aluminum plates support spine, and two curved aluminum plates support waist. 2Better support and correction of back, upright posture, better looking figure. 3Intimate anti?stroke pad protects soft anti?stroke pad close to curve of shoulder to disperse pressure of lead belt. 4Fixed shoulder force points form a horizontal pull perpendicular to the body to open the shoulders. 5Upward, loosening and downward adjustment and tightening, can adjust tightness according to own situation, and double?strap stretch can adjust shoulder and back tension freely and choose comfortably. PackageList: 1 x Back Brace