I don't think I have ever spent more than $60.00 for a pair of sunglasses but didn't like the fit and feel of the cheaper pairs. So I splurged and bought a pair of white flak jackets and couldn't be happier.
While exercising they don't bounce around on my face, hurt me ears or squeeze too tight, the tinted lenses are perfectly clear across the field of vision. While I'm happy with the level of tinting I can even change lenses if I choose. Should have bought a pair like this years ago.
My wife tried them on when she went running and I ended up buying her a pair of pink ones a week later so I could get mine back!
The glasses also have held up admirably in the field on two separate backpacking trips.
Would purchase these again in a heartbeat.
Incidentally, my head is on the small side and found glasses hard to fit or look too large. These fit and look perfect on my head and equally good on my friends with average sized heads. Probably look great on alien heads too...