Features： 1、Keel support, 3 carbon fiber material support on the back, flexible support strips, surround and support the waist to straighten the waist. 2、Integrated streamlined design, imported OK cloth, shoulder strap adopts a widened design, high?strength and strong steel frame, double Y cross belt. 3、Tuck your abdomen and straighten your back, and you have a beautiful posture. You can wear it for daily work and home rest. Choose as you like. 4、Soft and thick fabric and the cross?shaped back design better wrap the whole body. 5、Can help your body maintain a natural posture and is a good gift choice for others. Specification： Item Type: Back Brace Belt for Kids Material: High performance fiber elastic + nylon + polyester fiber SizeWaistHeightWeight S60-75cm / 23.6-29.5in130-160cm / 51.2-63in47.5-62.5kg/104.7-137.8lb M75-85cm / 29.5-33.5in160-175cm / 63-68.9in62.5-77.5kg/137.8-170.9lb L85-95cm / 33.5-37.4in175-185cm / 68.9-72.8in77.5-92.5kg/170.9-203.9lb XLAbove 95cm/37.4in185-195cm / 72.8-76.8inAbove 92.5kg/203.9lb Product Features: It has the functions of abdomen, waist protection, and maintenance of a beautiful body. Moisture absorption, breathability, perspiration, light and thin, four seasons wear Correct bad posture, improve eye distance, relieve collective fatigue, improve image quality 5 major advantages: Integrated streamlined design, imported OK cloth. The shoulder strap adopts a widened design, high strength and strong steel frame. Scope of Application: 1. Adolescents have poor sitting and walking posture to prevent the habit of bending over and lowering their heads, hunched back and close eyes habits 2. Relieve back pain caused by standing for a long time, sitting at desk for a long time, maintaining same posture for too long, etc. Instructions: Step 1: stretch out your arms and put on the adjustment shoulder strap to right position. Step 2: Pull down and level, adjust position of abdomen, and glue rough surfaces of abdomen. Step 3: Pull end of double Y cross-leader to abdomen, adjust tension properly and glue it. Step 4: After sticking two adjusting straps, raise your head and back straight, slim! 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 it to maximum Good position, stick protective buckle well to achieve best pulling effect. Package List： 1 x Posture Brace