Improve incorrect posture - Our back posture orthotics provide more effective support, pulling your muscles and spine back to their original position to improve posture. Let you get away from the expression of laziness and hunchback, and gradually develop the habit of good posture to improve self-confidence. Posture orthotics for men, women and children: please refer to size S: waist length 80cm, back height 37cm, applicable waist 63-78cm. Size M has a waist length of 90cm, a back height of 39cm, and a waist circumference of 74-91cm. L size has a waist length of 100cm, a back height of 41cm, and a waist circumference of 84-96cm. XL size has a waist length of 110cm, a back height of 44cm, and a waist circumference of 97-106cm. Adjustable and easy to use - You can wear this back posture orthotic device under your clothes when working, at home or on the go to get a straight back and a flat abdomen without anyone noticing it. Double support and more effective - our professional back posture orthotic device has two brackets on the back, providing strong support for the lower back and waist, and stabilizing and supporting the shoulders, chest and back. Better every day - put on our upper back orthosis for 1 to 2 hours every day, and you will soon begin to develop muscle memory. We suggest that you wear clothes first, and then wear our posture orthotics.