I've been battling fogged up glasses while hiking for 20+ years. I tried every product I could find, and never could find one that worked. I actually planned on getting Lasik surgery, specifically because of the fogging issue.

After not passing the surgery screening, I started digging again to see if there was anything new out. I ordered a pack of these cloths and a bottle of the liquid.

This weekend I tried the cloths while on a 12 hour hike in 40° weather, and I was blown away at how well they worked. I did have to reapply at one point, but that's not an issue.

This is a complete gamechanger for me, and I'll obviously have some in my pack going forward.

Ever since I was told about Fog block in 2019 I have carried a cloth with me 99% of the time. It helps keep my glasses fog free during surgery. 10/10 would recommend.

These work so well! I coach swim in the early morning and after getting out in the cold my glasses stay pretty clear. 10/10 recommend

Was a great stocking stuffer.
Also ordered some Jinkies

This did not help my glasses to not fog.