1. Product Dimensions: S; M; L 2. Color: Black 3. Material: Neoprene 4. Package Content: 1 Back Orthosis Advantages: 1. All - day Comfort: With a stylish appearance and light weight, our back support belt can be worn either outside or inside your clothes. There's no need to feel self - conscious about wearing our support belt. You can wear it at work, at home, or when going out, and no one will notice you're wearing it. 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 you free movement. This certified shoulder corrector provides reliable back support at all times. 3. Long - term Improvement Guarantee: Wear it for 15 - 30 minutes a day at first to gradually correct your posture. Remember, you must wear this device for a long time before you notice an improvement in your posture. We guarantee that you'll notice an initial change in your posture after 2 - 4 weeks. 4. Good Posture is both Healthy and Attractive for Both Men and Women: After wearing our back support belt for a while, muscle memory will form. This means that even without using the posture correction device, you can keep your back straight, and you'll be more confident than ever. 5. Support for the Back, Shoulders, and Collarbones and Pain Relief: It is designed to eliminate the uncomfortable pain in the upper back, lower back, shoulders, and neck. Usually, your back and shoulder pain is caused by poor posture. This effective back straightener will gradually reshape your stiff muscles and adjust your shoulders to improve your posture and align your body correctly.