I've worn these for 5 years. LOVE them. I'm in the polarized camp, and haven't had any distortion issues. These Native glasses (from what I was told when I bought them at Eastern Mountain Sports) were designed for bicycle racers. They have little vents on the top of the frame. Never had a problem with them fogging up, even on 100+ degree days when I'm sweating buckets.
Native Eyewear
You can't buy them off of the Native site, but they will link you to the various retailers that do sell them. I think mine are the Sprint, but I like a couple of the other options, too. There are better descriptions of the glasses on the REI site than found on the Native site, and there are good descriptions of the lenses on the Native site. Hooray for going back and forth between windows. Mine came with regular, clear and yellow lenses, but it looks like they only come with 2 now. Oh well.