Undoubtedly the best existing anti - fog, the SEA GOLD anti - fog. Highly concentrated anti - fog gel, the most effective anti - fog. Suitable for all glass and plastic lenses without risk to the silicone or rubber contours of the holding frame. Designed to eliminate fogging of diving masks as much as possible and apply quickly and easily in the field. Also suitable for ski goggles, face shields, binoculars and telescope.