oakleys are the best for sports, imho. that's the only real purpose for them, since most of them wrap-around and have a tight fit, they don't go loose. except for their wire series of course.
the m-frame series are the best for biking i believe, interchangeable lenses allow you to change to different ones for different riding conditions, the lenses in general are a lot larger, and since the frame only runs along the top, the lenses are allowed to flare out to the sides to provide more coverage.
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