johnwrote a review of Native Eyewear Dash XP Interchangeable Polarized Sunglasses on July 28, 2009
Couple of things you need to know before you purchase these. The polar lenses are very soft and scratch easily. Replacement lenses are pricey (around 40 clams). After a few months of wear, the lenses will "spider web" in the corners. Mine lasted nine months including new lens replacement.
If you are extreme in your activities (i.e. skydiving, tour of duty in Iraq, or extreme sports, look at the Gatorz and pass the Natives on by. The Natives are made for driving in air conditioned automobiles, no more no less.