The RB4214 carries on the Ray-Ban legacy for active men. Sporting a clean, masculine look with a simple rectangular design that is perfect for guys who like to stay on the move. Its flexible, resilient front is easy to wear and will make you look great without even breaking a sweat. Solid colors, genuine since 1937, the classic B-15 was originally developed for military use, offers a high level of clarity, comfort and protection. Featuring the same high performance qualities as its twin green lenses, the B-15 lenses are the brown alternative. With greater contrast in low light conditions, brown lenses give you the power to see more clearly. Polarized lenses drastically reduce the brightness of shiny surfaces, like chrome, and large bodies of water. Polar lenses reduce reflections and enhance contrast. improving visual clarity and reducing eye strain.