Features: 1. It is made of high-quality breathable spandex material through careful proceing and design with the characteristics of soft, comfortable and elastic. 2. When wearing this chest brace, it helps to improve the problem of humpback and restore the natural straightne of the beautiful back. 3. High elasticity comfortable shoulder wear convenient. With nylon clasp design, which can be adjusted to better fit your body. 4. Stretching the cro strap backward, stretching comprehensively, straightening the chest and back easily, fitting the back to help the spine return to improve the natural upright hunchback posture. 5. Decrease your shoulder and waist pain and improve humpback to shape a nice-looking figure. 6. Suitable for workers, teenagers and other people who have bad seating walking habits. Specifications: Material:Spandex Color:Black Features:Soft,comfortable,elastic,adjustable Gender:Men,women,unisex Item type:Braces & Supports Type:Humpback Correct Brace Function:Health Care,Humpback Correction Size:S/M/L/XL Size Back LengthShoulder Strap Length Adjusting Belt Length Fit Shoulder Width S 20cm 26cm 39cm 28-37CM M 20cm 31cm 48cm 33-46CM L/XL 20cm 37cm 58cm 40-54CM Package Included: 1x Back Posture Belt Notice: the "S" size is suitable for children, "M" size is suitable for Adult Women, "L" size is suitable for Adult Men, "XL" size is suitable for Adult Fat People.