mEssentials McNett M Essentials Anti-Fog Cleaner for Optics and Lenses Prevent dive masks from fogging underwater with these powerful anti-fog drops that performs even in cold water Clean scuba masks with this 2-in-1 formula thats non-toxic, biodegradable, and alcohol-free Apply easily on all glass and plastic scuba, snorkel and dive mask lenses; wont harm silicone or rubber Works on eye glasses, face masks, binoculars, and telescopes; not recommended for swim goggles Packaging may vary