Product Description The reusable AB Mask Anti Fog Cloth will make foggy glasses a thing of the past. After one use, your glasses won t get foggy for up to 48 hours. Simply breath onto your lenses to create fog, then rub the lens with this cloth before the fog clears. Not only will The AB Mask Anti Fog Cloth leave your glasses fog free, but it will also protect your lenses from smears and dust, giving you clear and uninterrupted vision all day long. This handy cloth can be re used up to 1000 times. Need more optical advice help? Ask our optical experts