I use Rudy Project Kerosenes - work really well for me. Keep me fairly cool on my 12-mile bike commute - and the swappable lenses are a godsend for when I have to get back late in the evening. One of their nicest features is the built-in vent. I've never experienced fogging with them, whether cycling or skiing. I'd not wear them around town, though - too much of a sports geek look.