jeffrey38539 wrote a review of Smith Slider Replacement Lenses - Gray Polarized GP15 on September 3, 2003
If you're looking for replacement lenses, you already know that the Smith Sliders are all around great sunglasses for outdoor activity.
I replaced my brown lenses with the grey polarized because I knew that I would be spending 4 weeks on a boat in southern Georgia and the polarized lenses would be better at cutting glare. True to claim, I could see clearer and was less tired at the end of a 15 hour day.
However, the polarized lenses do have a tendency to cause color shifts when looking through tinted or UV reducing glass (every car looks like it has flip-flop paint), so if you plan on using these a lot when driving, consider having a set of non-polarized lenses as well.