Features: The Back Straightener features ergonomic design with back straps and adjustable shoulder bands, providing automatic postures correction without manual adjustments for natural spinal alignment. Craft from breathable polyester blend, this postures corrector belt offering ergonomic compression and seamless concealment under clothing while maintaining all day comfort through flexible fabric technology. Great for office worker, students, driver, fitness enthusiasts and anyone experiencing hunchback issues. Suitable for long hour of sitting in office, school, or while driving, it can also be used at home for daily postures improvement. Ergonomic Support and postures Correction, for back support and muscle training. Practical and portable, this postures corrector can be worn discreetly under clothing, making it convenient for everyday wear and travel. Specifications: Component: Polyester Color: Black Size:approx. As picture shown Size:S Recommended weight:45-55kg Size:M Recommended weight:55-65kg Size:L Recommended weight:65-75kg Size:XL Recommended weight:75-85kg Size:XXL Recommended weight:85-100kg Quantity: 1pc Package Includes: 1pc Innovative Back Straightener note: Please allow 1-3cm error due to manual measurement. please sure you not mind before you bid. Due to difference between different monitors, the picture may not reflect the actual color.