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After sitting on and breaking a pair of ray-bans I got a pair of folding ray-bans. I wore these until I started noticing freckling under my eyes where they really should have been protected.
The folders tip away from your face and are often useless without a hat.
So as a response to that I went with these goofy clifdens and I am quite happy with them.
Only thing is I think they let through a lot of yellow light. Around dawn or dusk they seem much less effective.