How to Keep Glasses from Fogging With a Mask？ However, when conditions permit, it is best to use professional anti-fog products, such as glasses anti-fog wipes, lens anti-fog cloth, etc., which are the best products that are convenient to carry when traveling. Why do glasses fog up when wearing a mask? When we breathe, the hot air we emit escapes the top of the mask and hits the cooler lenses of our glasses. This actually creates condensation (also known as fog).
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