Disappointed!
I purchased this product srictly to reduce the fogging of my glasses while wearing a mask and for the portable nature versus anti-fogging fabrics. The fogging is so severe that I have to remove my glasses to see as my lenses become opaque. In contrast I use a fabric anti-fogging cloth available from Amazon with superior performance. Admittedly living in an area with varying humidity levels, passing through air conditioned and non air conditioned areas and wearing a properly applied N95 mask truly tests a product's effectiveness.
Rating: 2 stars