I own several pairs of Smith sunglasses; they all quite good. I use all of them for various kinds of fly-fishing opportunities, both on the salt and every kind of river/stream you can imagine. I mostly vary wearing them based upon light conditions (I have various colored, all polarized/photochromic lenses). I even wear them here in Southern California to daily runs on the beach. This pair of Cheetahs with ChromaPop Polarized Blue Mirror lenses are probably the BEST I have ever owned! Am headed to the Snake next week and they will be along for the ride. And they look cool too. The Sky Tortoise frame has generated more compliments/great remarks (where can I get those?) that I have ever had from any sunglasses. A total winner.