In reply to EddInaBox:
I disagree. I have had loads of sunglasses, Which also get used for mountain biking.
I have had 3 pairs of oakleys, 1 Arnette, 1 Rudy Project, 1 Specialised.
I still have the oakleys and rudys.
The rudys are bike specific, and you wouldn't wear them in the street.
One pair of oakleys is 15 years old, but now looks dated.
The other glasses have fallen apart due to various things.
Maybe it's looking after them, as they are over 50quid.....
The fit, on my head at least, is so much better than cheaper glasses.
Maybe they are overpriced, but the quality is better.
Pays yer money, takes yer choice.