Equipped with 2alloy supporting plates at the back, which can help you correct posture in every minute you wear it..Sliding shoulder pad design - it is not easy to move and fall off, making you feel less stressed and comfortable for a long time.The elastic belt has strong adhesive force and super flexibility, easy to adjust and not easy to fall off, better fitting the waist.Offering M, L, XL three sizes to choose, suitable for adults and kids between 120cm and 180cm.Gender: unisex.Specifications:Color: blackSize: M, L, XLPacking list:1* Back TrainerNOTICE:1. Due to different monitors and different photos, there may be slight color difference between the actual product and the photo. Please understand, we guarantee that the style is the same as the picture.2. The size is manually measured, there may be an error of 2-5cm, which will not affect the use.3. Only sell main products, not other accessories.4. After receiving the packaging, please check the packaging and products carefully. If the received item is defective or has any problems, please contact us via email to resolve the problem. We will reply as soon as possible and try our best to meet your needs.