Normal wear and the frames loosen and the lenses fall out. Each time the lens breaks on the ground. I bought one pair after another and same problems. Do not buy. Optics was great but Serengetti quality in S-flex is TERRIBLE and expensive.
Pros: Great feel
Cons: Lenses popped out ...went thru two pair
This review was written in the old system and had content requirements that are different than reviews written today.