EFFECTIVELong-term incorrect sitting position and little exercise cause various back, neck or shoulder problems, straight holder effectively helps you with back pain, poor posture or hunchback.pain, poor posture or hunchback. SCIENTIFIC STRUCTURE DESIGN Scientific design to correct bad posture conveniently. Then feel relaxed and comfortable. Four sizes to choose from, suitable for all people. S: Lower Bust 60cm70cm; M: Lower Bust 70cm85cm; L: Lower Bust 85cm100cm; XL: Lower Bust 100cm115cm. HIGH QUALITY From the lining on the shoulders to the adjustable straps, we use the highest quality materials. Thanks to the soft, light but strong shoulder straps, which can prevent the skin from being pinched, you can carry it comfortably when driving, vacuuming, cooking and working at the desk. NOTE 1. The size of the product is measured manually, and there will be an error of 2-3mm due to factors such as different measurement tools and measurement methods. 2. This product is all taken in kind, but due to differences in photography, lighting, color deviation, and personal understanding of color. As a result, there may be some color difference between the actual product and the photo, and the color is subject to the actual product. 3. Please take good care of our products