Lens fog no more or less than all other goggles I have ever owned and I have a drawer full. These are my second Vanquisher googles I have purchased in the last year. Clear lenses for the days when the sun decides to rise late, and mirrored for those sunny days.

They don't leak and they don't fog up; at least for now. It's a tight fit even with the band extended almost all the way out. A little painful when removing after a long swim.

Work out with them everyday and they stay on well for diving.

Great goggles. Snug fit. Fair price.

I bought this product with the expectation that it will not fog for at least the first couple of months of use. However, fog began accumulating on the inside after the first two times I used the product. The product fits great once the straps are adjusted to the appropriate length. The range of vision is pretty good too, provided the fog does not accumulate. Overall, I found the product to be okay.