Considerate design for improved health. - The design keeps your back straight and comfortable from sitting or standing all day. - The humpback corrector improves the humpback by aligning your spine to your natural position. - Brings your shoulders back to the correct position and improves for better posture while relieving back and neck. - The strap goes under your bra line and provides a nice firm hold. Perfect for wearing under clothing and adding extra buoyancy to your bra. Size: S (Under chest 60-70 cm / 23.6-27.5 inches). M (Under chest 65-75 cm / 25.6-29.5 inches). L (Under chest 70-80 cm / 27.5-31.5 inches). XL (Under chest 75-85 cm / 29.5-33.5 inches). * Please check your size with our size chart before you buy it. The size may vary by 1 to 2 cm due to manual measurement. Operation: Each figure is different. If you have a size problem, please send us an email. We will solve it as soon as possible. We will do our best to provide every customer with high-quality products.