Escape prevention belt to enhance safety in child seats. Secure with a multi-lock design. - Product Name: Child Seat Escape Prevention Belt - Functions: Prevents belt escape, prevents belt loosening - Design: Multi-lock design, quilted material I purchased this online. ☺︎ After fastening the belt, the multi-lock function should also work, but the upper belt has a defect and doesn't work. The lower one does. The belt itself clicks into place, so if that's acceptable, please consider purchasing.