Retractable elastic strap that adjusts the back to your shoulder width for a neat, elegant look whether you are walking or standing. Key benefits Adjustable fit: The retractable elastic strap lets you set the back tension and width to suit your shoulder size for a comfortable, personalized fit. Clean silhouette: Helps create a smoother, more elegant appearance while moving or standing by holding fabric and straps in place. Neat and functional design: Retractable mechanism keeps excess strap tidy and reduces slippage without constant readjustment. Function and performance Material: Elastic rubber strap provides reliable stretch and return for consistent tension and comfort. Retractable mechanism: Smooth retraction maintains the chosen fit and prevents loose or dangling straps. Simple on-the-go adjustment: Quickly tighten or loosen the back to achieve the desired level of snugness. Compatibility and sizing Adjustable to a range of shoulder widths; set the tension and back width to the tightness that suits you best. Designed to integrate with garments or setups that require an adjustable elastic back strap (uses the product’s retractable elastic function and shoulder-width adjustment). Practical use scenarios Everyday wear: Adjust the strap for a polished, comfortable fit during daily activities, commuting, or at the office. Events and standing occasions: Keep your outfit looking tidy and elegant while standing for long periods at receptions, presentations, or social