XS Height 90-135cm Weight 11-27kg S Height 125-165cm Weight 27-45kg M Height 155-175cm Weight 45-65kg L Height 165-185cm Weight 65-75kg XL Height 170-195cm Weight 75-95kg 1.High-quality fabrics, rigorous tailors. Soft padding protects the shoulders, elasticity at the shoulders, two metal supports on the back, and stylish, lightweight back braces make you more confident. 2.correct, treat, assist, and support posture correction orthopedic problems: Poor posture, neck or shoulder pain, back pain, osteoporosis, scoliosis, kyphosis, sagging shoulders, and laziness. 3.Adjustable Posture Trainer is designed to comfortably fit all body types and comes in 5 sizes. Perfect solution for your bad posture, back pain, humpback, laziness and overall back problems, making it suitable for teenagers, adults and seniors. 4. Whether you're worried about using your computer for extended periods of time or your child's homework, our humpback posture correctors are perfect solutions that automatically correct posture without any extra effort. 5. Pick a larger size, wear it for 1-2 hours for the first time, gradually extend the time after adjustment, and do not use it during sleep.