S - Chest circumference: 46-68cm 18.1-26.7inchSuit for weight: 20-40KGM - Chest circumference: 68-91cm 26.7-35.8inchSuit for weight: 40-80KGL - Chest circumference: 91-119cm 35.8-46.8inchSuit for weight: 70-100KGXL - Chest circumference: 119-140cm 46.8-55inchSuit for weight: 80-120KG6. Reduce stress and bring more calm into your life.7. Look more confident and give people a good impression.About the Product:1. 6 Size Available. Back Posture Corrector with breathable and latex-free adjustment strap.2. Shoulder Support Brace Pull back your Upper Back to the right position. And then improve your whole body posture during work or life.3. You can use it not only when you are sitting on computer or driving a car, but also when you are playing sports or gardening. What is more, you can use it at home when you are doing housework, or watching TV.4. Posture brace filed with Lightweight neoprene,can be worn comfortably under or over clothing.Correct your posture all day.You can put on and adjust by yourself.5. This lightweight back support should be worn daily. First couple of days wear it for 10-20 minutes only, than add 10 minutes every day. Your back and shoulders will slowly adjust and you will build muscle memory for the right posture.6. By aligning properly your posture, it takes pressure off of key areas, thus alleviating back, neck, shoulder and clavicle pain.Notes: 1.Please allow 1-2cm measuring deviation due to manual measurement.2.Due to various monitors and lighting conditions, colors may be slightly different from listed photos.Dear Sir and Graceful Lady: I'm glad you can come to my store, it's an honor to have you. I hope the products in my store can satisfy you. If you need, you can send an email to ask, I will be happy to answer it for you. If you don't understand anything about the product, please give me a chance to answer your questions. I hope you have2. Realign your vertebrae to their proper position. 3. Relieve upper and lower back pain, neck pain. 1. Take a weight off your shoulders. 4. Reduce slouching, hunching and slumping by corrector your posture. 5. Recover mobility and strengthen the muscles.