I bought this in October 2020. It's now January 2021 so I've had the opportunity to use this fabric many times on several different glasses in different weather while wearing a face mask. It prevents fogging up well, but the BIGGEST problem for me is that after about 5-10 minutes of running this anti-fog magic, the lenses of my goggles are covered in a slimy, wet layer that always starts to come on the lenses to drip and can make it very difficult to see. . Kind of illogical. If you wipe it with anything other than this cloth, the anti-fog will disappear. So wipe your glasses with this special cloth about every 5 minutes when you want to see. Three stars because it actually works as advertised to prevent fogging. and if you take off the mask and let the goggles dry, the liquid will disappear. But the liquid that keeps collecting and dripping onto my lenses makes it almost useless.
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