A. Neck and Shoulder Corrector: Use it consistently for 21 days, wearing it 1 - 2 hours a day to help achieve a healthy posture. This unisex corrector can help open your shoulders. While opening your shoulders, your posture will become more upright. The chest support design can effectively hold up your chest, making your body curve clearer and more beautiful, and boosting your confidence in the workplace. B. Working Principle: By pulling the shoulders, it allows the bones to return to a correct position, making the bones healthier, improving the circulatory system, making breathing more even, and helping develop good sitting, standing, and walking habits. C. Adjustable and Comfortable to Wear: It uses a soft, breathable, comfortable, light, and thin elastic fabric. Following the scientific concepts of ergonomics and mechanics, it features a multi - structured, exquisitely customized streamlined design. The wrapped design on the shoulders ensures a more comfortable fit. Its breathability makes it suitable for use in summer, and the fabric guarantees a good user experience. D. Instantly Relieve Back Pain: This corrector is designed to relieve hunchback, neck, chest, and back pain caused by long - term work, using mobile phones, and using computers. This back support is suitable for people with mild hunchback, those who often look down at their phones, people who work at a desk for a long time, and office clerks, providing back support. E. Unisex: It has a comfortable, beautiful, and lightweight appearance. It is not easily noticeable when worn under clothes. This back support has a good texture and looks good even when worn outdoors. It is suitable for various occasions, such as work, at home, leisure, driving, walking, and sports. Product Dimensions: Shoulder width is approximately 35 - 45 cm. Size S: Suitable for people weighing 25 - 40 kg. Size M: Suitable for people weighing 40 - 60 kg. Size L: Suitable for people weighing 60 - 70 kg.