Richard R.wrote a review of Tifosi Optics Logic Interchangeable Sunglasses on January 12, 2012
I must admit they are great glasses, too bad they dont have polarization though. I currently live in the tropics, where we are usually at 90 - 100 % humidity year round. These glasses do fog once in a while, but all I need to do is move them down the bridge of my nose and it copes superbly.
I have also gone trail running in them, they do move a little, however for the price, its just fine.
The best features on these glasses is how you can mold the sinus pad, and temple pads on the side any way you want. With 2 extra lenses your good to go. It is a little difficult to take out the lens; I swear it would snap when I tried the first couple of times.