SIZE CHART: S: for chest circumference 28-32inch(71-81cm); M: for chest circumference 32-36inch(81-91cm); L: for chest circumference 36-48inch(91-121cm); Product parameters: Product material: polyester cloth covered with latex; polyethylene sandwiched with Velcro and polyester elastic Product Features: Effectively prevent and reduce the risk of back pain, improve posture; can pull the shoulders and straighten the spine, stretch the chest, and has a significant effect on preventing hunches. REGAIN YOUR CONFIDENCE WITH GOOD POSTURE Our back posture corrector provides more effective support to your posture that will help you develop muscle memory to keep your back straight overtime. Pull your muscles and spine back to original alignment for posture improvement. Our posture corrector for men keeps you away from slouching and hunching looks. It will also help improve your overall spine health, Improve confidence. INNOVATE DESIGN & EASY TO WEAR Follow the scientific concepts of ergonomics and mechanics, forming a multi-structure exquisite tailored streamline design. Wear the posture corrector upper back brace according to your body shape and adjust the belt freely. Please control the time within about 15 to 25 minutes when first using, and then increase 20 minutes each day until wearing 2 hours every day. HIGH-QUALITY FABRICCOMFORTABLE AND ADJUSTABLE Our product is sturdy but lightweight, breathable, washable. Our back straightener posture corrector Shoulder-wrap design makes you feel very comfortable, breathable features suitable for summer wear. Without ever getting uncomfortable or irritating your skin as most other cheaper posture correctors do, it won't cause armpit pain. Velcro design, you can adjust the tension freely. SUITABLE FOR MUCH OCCASIONS The back brace posture corrector product design is small and exquisite. You can wear it invisibly under your coat while at home, office, driving, walking, shopping, or at a party. There is no need to feel self-conscious because the back posture corrector is undetectable under your shirt or clothes. The upper abdomen strap prevents sagging of the chest and helps you easily create an elegant body curve.