Polarized lenses reduce 99% of visible glare for increased sharpness Lightweight and virtually shatterproof, polycarbonate lenses Lenses are 20 times more impact resistant than glass and 1/3 th weight Sturdy metal alloy frames feature spring hinges for a custom fit Silicone nose pads become tackier when wet for reliable grip 8-base-curve lenses designed to fit medium sized faces Best Use:   Casual Frame Material:   Metal Alloy Lens Material:   Polycarbonate UV Protection:   100%