Very nice shades, best ive ever owned. The interlock is nice but i find i don't really use it, i could seeing it being nice if you messed up a lens. They fit really well, and don't move around much. I have noticed that they fog up a little easier than others, but nothing too bad. I was wearing these skate boarding and got hit by a car leaving a cut from where the glasses were, however i think they took some impact. During the crash part of the earpiece broke, but smith was chill to warranty it. Very solid shades from a very solid company

These are the best glasses I have ever worn. Period. I tried to find these starting a month ago, when I saw them on the Smith website. I walked into a local shop Sunday, tried them on, and bought them immediately. They fit guys with a little larger bridge on the nose, and a wider, bigger face. Don't let the Medium to Large fit thing scare you away. They fit big. The optics are incredible, they come with three lenses, and the lifetime warranty is awesome. I think Smith is all I use for my optics anymore. If you love their goggles, you'll love their sunglasses. Especially these. Even with the price, I'm thinking of picking up another pair. EXCELLENT.

Great lenses, look cool, good coverage. I'm only giving them 4 stars because I found the fit on the bridge of the nose to be slightly tight (an issue I haven't had with any other sunglasses). They got a bit uncomfortable after wearing them on a boat for 5 hours. But for running/hiking/biking, these can't be beat -- stay in place perfectly.

The Good: Great styling, they fit my large-ish head very well and look nice. The optics work well and the lenses offer a wide range of light management. The lens swap process is simple and the case comes with a special pocket to store all of them.

The Bad: Forehead sweat tends to pool around the top of the frame, stream down the lenses, and remain inside the lens area.

The Verdict: I bought these for biking. I ride just about every day. I like the versatility that the inter-lock lens system allows, especially when using the clear lenses for night riding. I sweat when I ride and, as I write this review, I'm doing so in the brutal summer months. The oversize frames tend to come in contact with my forehead and and act as sweat conduits. This is annoying at best and has never significantly altered my vision. I don't recall having this issue with other frames.

In conclusion: I like them and I don't regret my purchase. I can deal with the sweat, but they're not perfect. They are great for the price and do well in all other respects.