Product: Back Posture Correction Belt. Style: Regular. Color: Grey/Black. Material: Swan velvet fabric+high-density sponge+nylon webbing. Single gram weight (including packaging): S 65g, M 75g, L 90g, XL 95g. Packaging: bagged. Features: 1. Made of high-quality breathable spandex, soft, comfortable and elastic. 2. Helps to improve the hunchback problem and restore the natural straightness of the back. 3. High elastic and comfortable shoulders, easy to wear with velcro design. 4. Stretches the cross belt backward, easily straightens the chest and back. 5. Suitable for workers, teenagers and other people with poor sitting posture and walking habits.