A. Product Dimensions: S; M; L B. Color: Black C. Material: Neoprene D. Package Content: 1 Back Orthosis Advantages: 1. All - day Comfort: With a stylish appearance and light weight, the back support belt can be worn either outside or inside clothes. There's no need to feel self - conscious about wearing it. It can be worn at work, at home, or when going out, and people may not notice it's being worn. 2. Back Posture Corrector: The adjustment range of the back support shoulder straps is 25 - 43 inches. It is a unisex posture correction belt. It is flexible enough to allow free movement. This certified shoulder corrector can provide reliable back support. 3. Long - term Improvement Guarantee: Wear it for 15 - 30 minutes a day at first to gradually correct posture. Remember, it usually takes some time of wearing this device before an improvement in posture can be noticed. It is guaranteed that an initial change in posture may be noticed after 2 - 4 weeks. 4. Good Posture is both Healthy and Attractive for Both Men and Women: After wearing the back support belt for a while, muscle memory may form. This means that even without using the posture correction device, one may be able to keep the back straight and feel more confident. 5. Support for the Back, Shoulders, and Collarbones and Pain Relief: It is designed to reduce the uncomfortable pain in the upper back, lower back, shoulders, and neck. Usually, back and shoulder pain is caused by poor posture. This effective back straightener can gradually reshape stiff muscles and adjust the shoulders to improve posture and align the body.