I bought my first fog blocker at the beginning of 2020 and have used ne regularly ever since to keep my lenses clear while I work in a mask.
I wear glasses and hated my glasses fogging up while wearing a mask. Tried this cloth and it totally works!! I bought one for my grandson and two for myself! ❤️ it
The Fog blocker works well but the cost per cloth is expensive. Still they are probably the best thing out there if you don’t want fogged up glasses when wearing a mask.
It works, but the effect doesn’t last as long as promised.
Lasts roughly 4-6 hours