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Message: <blockquote data-quote="BearCrap" data-source="post: 2753486" data-attributes="member: 736050">You can buy anti-fog spray at any camera or eye glass store. I treat all my optics this way and even use it on car and boat windows. I often have to wear glasses and live in a very wet area of Alaska where its cold and wet most of the year. There are many name brands that work. But I found anti-fog made for car windows can leave a build up on glass such as Rain-X. However the stuff made for fine optics I didn’t have that problem with.Another thing that helps is use a neoprene face mask that has an opening for the nose and mouth but fits snug so your breath doesn’t go under the mask and out under the glasses. I have less problems with neoprene building up with ice around my nose and mouth than other fabrics and knit masks. Also that kind of mask block the wind better than knit masks.</blockquote>