JunnKay -- Join us in Sports. Enjoy Sports! How to prevent fogging when swimming? The anti-fogging coating on inside lens will eventually fade over time, here are some tips for how to maintain the fog-resistance function of the swimming goggles: DO NOT TOUCH OR WIPE THE INNER SIDE OF THE LENS. There is anti-fog coating on the inner side of the lens. When use your goggles, please do not touch or wipe the inner side. Use anti-fog spray. Put them on inside lens. 2.Activate the anti-fogging coating of inside lens by soaking the goggles in the water before swimming. 3.Make sure the goggles fit tightly on your face and there is no gap when swimming. 4.Place one small drop of dish soap on each lens, followed by a rinse in cool water for one to two minutes. 5.Spit and lick the inside lens like the athletes do. Maintenance 1.After you swim, wash the goggles with fresh water and allow to air dry at a cool and clean place. Please don' t wipe the inner wall of the lenses with your hands. Don' t leave your swim goggles under direct sunlight as this can dry the soft silicone seals and fade its color. Protect your goggles for swimming by storing them in their protective case. Don’t leave your goggles in your car in summer or under any high temperature environment to protect the lens coatings.