Want fog-free eyewear in the worst temperature and humidity conditions? Wonder no more. Fog Stopper cloth provides an unmatched effectiveness on all lens and screen types. The unique patented anti-fog formula works really well on all coatings, anti-reflective and hydrophobic included! The advanced nano coating technology sticks to the surface uniformly and creates a protective layer that prevents condensation. It is very effective on both plastic and glass screens. This cloth was designed for a quick and easy application on the go. Apply 2 water drops on the inside of each lens and gently wipe the surface with Fog Stopper microfiber cloth. If you don't have any water on hand, use your breath to moist the lenses. Allow to air dry for 15-20 seconds. Lenses will remain fog-free for 24h. Each application of Fog Stopper cloth will remain effective until touched or rubbed off. One Fog Stopper cloth can be reused for 600 times. Experience a fog-free vision on your eyeglasses and sunglasses, face shields, goggles, respirator masks, safety glasses, SCBA masks, swimming goggles, dive masks, visors, windshields, paintball and airsoft masks, optics, scopes, binoculars, ski and snowboard goggles. AR Fog Stopper has also a great defogging performance on electronic devices (screens and monitors) like cell phones, tablets, virtual reality (VR) headsets, smart watches, camera lenses and more! Eyeglass Supply Store guarantees a hassle-free return policy. NOTE: store Fog Stopper cloth in a dry place.