Improve posture: The posture orthotic device pulls the shoulder tightly back to the original position. Effectively relieve shoulder, neck or upper back pain, and help relieve hunchback problems. Back support: double cross design and two support plates in the back strip provide strong support from all angles, and gently disperse the tension required for alignment and stability without hurting the back. Easy to use: Fully adjustable strap with a strong Velcro, easy to wear and adjust for best results. Equipped with a separate extension belt, so that the product can adapt to a wider range of body types. Comfort bracket: made of breathable and comfortable materials. The shoulder belt is very wide, so the pressure points are scattered, and it will not cut into the armpit depression. An extra armpit cushion is provided so that you can slide to a comfortable position to reduce friction. Men's and women's back support: The back support has 4 sizes to choose from, which can help you find the perfect fit and enhance comfort, suitable for both men and women. Product Description Comfortable and breathable Please measure the waist circumference with a tape measure, and then refer to the size chart to select the appropriate size. Size reference value: S size is 45cm high and 98cm long. Size M is 45cm high and 100cm long. The L code is 45cm high and 102cm long. XL is 45cm high and 104cm long. Question1: Can I wear this for a long time? A1: It is not recommended to use more than 30 minutes at the beginning. You can start wearing it for 15-20 minutes a day, and then gradually extend it for 10-20 minutes to 1 hour a day. Don't wear it while sleeping. If you feel unwell, please stop using it immediately. Q2: How do I know if it is useful for me? A2: Posture orthotics can provide more effective support, remind you to keep your back straight, help your muscles and spine return to the original alignment, and improve your posture. Please keep it for 30-60 minutes every day. You'll feel different Note: Because everyone has different levels of shoulder and back problems, the use effect is different. We recommend users to stick to it. Q3: Can I wear this under my clothes? A3: Although the material of the pose corrector is comfortable and close to the skin, we still do not recommend direct contact with the skin to ensure your comfort. Q4: Is it useful for work? A4: Yes, we have designed the back support of this posture orthotic device, taking into account the maximum comfort, so you can easily wear it at work, driving, at home, working outside, and even in sports activities!