These glasses are great! Underwater visibility is amazing. If you fish, good polarized glasses are essential. Not all polarized glasses are equal! Don't be fooled into thinking a $20 pair of glasses can be as good as these. I also have a pair of Smith Optics glasses that are amazing. Those are amber lens and I needed a darker lens for brighter days, and Costa is largely considered the best brand for fishing sunglasses and these were about $50 less than the Smith Optics I have so I figured I would take a chance. Glad I did. Now I see why pro bass fishermen love this brand. Believe the hype about these glasses. Some others have shown that they were given the 400G lenses instead of the 580G. Maybe I got lucky, but I ordered the Flat Black w/Green Mirror 580G and that's exactly what I got. The lenses even have a little 580 emblem on the right lens.