The C4S Glasses Holder prevents your valuable glasses from falling off. Especially during sports and work (e.g. overhead), the glasses cannot slip or get lost. The elasticated Avelastic (PU) tubes at the ends of the glasses strap are simply pulled over the arms of the glasses. The goggle strap cannot slip off the temples during use and holds the goggles securely in place. The adjustable stopper can be used to tighten the strap if necessary.