A. Simple and comfortable design, with freely adjustable tightness, to remind oneself not to slouch. B. Good for health and helps improve posture: Based on ergonomic design, it helps develop the habit of keeping a straight back, strengthens shoulder strength, and shapes a good posture. C. Can be worn as an undergarment: It can be worn inside a shirt. When one goes out with a straight posture, one will look confident, healthy, and younger. The shoulder straps are designed with strong hook - and - loop fasteners, allowing for free adjustment of elasticity. It is comfortable to wear without a sense of oppression and helps correct the back line, making one elegant and charming. D. Specification parameters: - Model: Hunchback correction belt - Applicable population: General public - Size, Height (cm), Weight (kg), Chest circumference (cm) - S: 150 - 165, 40 - 55, 71 - 80 - M: 155 - 170, 55 - 70, 81 - 91 - L: 165 - 182, 70 - 80, 91 - 101 E. Package content: 1 hunchback correction belt