From Maui Jim, the Stringray sunglasses are great for everyday variable conditions, from full sun to overcast and feature: frames of cellulose propionate, a strong, extremely lightweight, injection-molded plastic with adjustable metal-core temples for a personal fit patented PolarizedPlus®2--a color-infused lens technology that wipes out 99.9% of glare, 100% of harmful UV and boosts color via specially designed lens treatments so that your view is clearer with crisper contrast and amazing brilliance bronze-tinted ST (SuperThin) Glass, scratch resistant and 20% thinner and lighter than standard laminated glass lenses for long-wearing comfort anti-corrosive nickel/silver spring that defies the elements and offers a secure, comfortable fit fixed saddle-style design with embedded, non-slip silicone pads for comfort saltwater-safe lens treatments and framesImported.