NO spring hinges, frame broke 2x, poor quality
"Pros: Comfortable, light weight, fit well, less eye fatigue Cons: NO spring hinges. These are simple folding hinges, no spring action. Poor quality control/design. Bought a pair 4 years ago, and they broke 2x after several years of gentle use, at the same "weld" (where left side of upper frame meets lens frame). Superglued, broke again at same spot."