This is a dry-type anti-fog cloth for glasses, "Reusable Anti-Fog Cloth for Glasses," that quickly and easily eliminates the annoying lens fogging that occurs when wearing a mask or eating. Simply wipe your glasses when they fog up! It maintains lens clarity and provides a streak-free finish. The cloth comes in a pack of 3. Each cloth can be used repeatedly, approximately 25 times. It uses a separate pack with a zipper, divided into two sections, allowing you to store and keep used and unused cloths separately. It's also convenient for carrying. Because it's a dry cloth, it can be used repeatedly. This is a set of 5 packs, each containing 3 sheets.