Anti-corrosive, stainless steel pin hinge offers lightweight strength All Maui Jim sunglasses feature PolarizedPlus2 lens technology that go beyond shielding your eyes from glare and harmful UV rays by enhancing colors to reveal the true beauty of the world around you Enjoy ultimate UV protection combined with premuim style, incredible durability, glare-free vision, and color-boosting patented technologies HCL Bronze lenses feature a warm tint that provides versatility in changing light conditions Frames constructed from lightweight, injected nylon, designed for extreme comfort and extended wear time