Key benefits Personalized fit: The back adjusts to your shoulder width so you can set the level of snugness that feels best for you. This prevents slipping or pinching and keeps the product comfortable for extended wear. Secure, flexible hold: A retractable elastic strap provides stretch and recovery so the item moves with you while maintaining support. Polished appearance: Designed to enhance your silhouette, it helps you look elegant whether you are walking or standing. What it does and why you need it Delivers a customizable, comfortable fit across different shoulder widths to reduce readjustment and improve daily comfort. The retractable elastic strap offers reliable tension control without restricting movement. Improves posture and appearance discreetly so you can feel confident in everyday situations. Key attributes Function: Adjustable back for shoulder-width customization; retractable elastic strap for adaptive support. Compatibility: Designed to accommodate a range of shoulder widths through simple adjustment. Performance: Stable hold during movement; maintains a neat, elegant look while walking or standing. Care/support: Customer service available for questions; we will respond within 24 hours. Practical use scenarios Daily wear: Use it under work or casual clothing to maintain a refined silhouette throughout the day. Event or formal settings: Keeps lines neat and posture confident when attending meetings, dinners, or ceremonies. Travel and commuting: Provides secure, comfortable support during walks, transfers, and long periods of standing. Customer support If you have any questions about the product, please contact us. We will reply within 24 hours.