Flimsy metal material - Serengeti Large Aviator Rx Prescription Sunglasses

I have had these repaired twice. I admit I'm rough and tumble but I try to take good care of expensive eyeglasses. I cannot figure why nice glasses break more easily than my cheap ones that last for years. Why don't they make nice ones out of more flexible material?
Pros: Amber lenses, Aviators.
Cons: Metal is flimsy and broke after a year of use.

This review was written in the old system and had content requirements that are different than reviews written today.