Works well enough. I bought it to wear a mask while shopping and the glasses don't fog up from breathing. This is not a fog-free solution; I'm still groggy with every breath, but it's dissipating fast enough to see. It's like fog/no fog/fog per second, which is annoying when trying to walk but definitely better than constant fog. I can't wear a mask without putting this thing over my glasses. Those of you who work with a mask all day in hospitals, emergency rooms, etc. might want to try something different depending on whether you have anti-reflective coatings and other coatings on your lenses like mine because you still sweat. immediately with every breath. And in my experience, the app doesn't last long; I have to wear it every time I go out. On the other hand, I haven't tried any other demisters, so maybe they're all like that - only partially successful. I agree with the company that, in theory, a rub-on solution offers better coverage than a spray (although, again, not necessarily a longer duration per application). It certainly makes my glasses more transparent than spray; at least it's a damn good cleaner. It takes a few times to get used to the application. At first you press too much with your fingertip, but the more you do it, the easier it gets. I thought I would probably return this product, but it worked well enough to keep to myself. Your ads are true. However, the fabric is almost useless; too small.
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