These are non-slip silicone covers (set of 4) that attach to the temples of your glasses. The soft, grippy silicone material fits gently around your ears. It prevents your glasses from slipping down and supports a stable fit. Recommended for those concerned about slipping due to sweat or movement, and for everyday use, work, or study. --------------------- About Delivery: Delivered via postal mail, so you can rest assured even when you're not home. *Ships via standard mail. Please note that delivery may take up to a week depending on your region and circumstances.