Effectively correct the problem of incorrect posture of the adults' back by training your muscles and spine to return to their natural alignment, and help them to develop better skeletal development. Effective for adult's walking position, due to long-term sitting posture is not correct. Features - Color: Black. - Material: Polyester. - Size S: About 50-80 cm(Suitable Waist), 60-90cm(Chest). - Size : About 60-90 cm(Suitable Waist), 70-100cm(Chest). - Size L: About 70-110 cm(Suitable Waist), 80-110cm(Chest). - Size XL: About 100-130 cm(Suitable Waist), 110-140cm(Chest). - It will fit perfectly on your back and keep your upper body upright to improve your posture. - Easy to wear under clothing. - The aids in the treatment of back , , spondylolisthesis, and thoracic outlet - Breathable fabric, rigorous . - Wearing for a long time can improve bad posture on the back and improve self confidence. Package list: 1 x Hunchback Correcting Belt