no photochromic reaction to sunlight. I've worn them a few times over the summer here in Arizona while biking for a few hours in fairly intense sunlight and I haven't noticed any lens fogging. If you're just looking for a large pair of goggles that protect against high winds and are fairly light, then this is a good buy. The lenses seem to protrude more than many other sunglasses. They appear to cover most of your forehead. However, I still had no problem with my goggles hitting my helmet.
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