Dual-colored lenses can be stylish and functional, as they may provide different lens tints for various lighting conditions. Brown lenses are often chosen for their ability to enhance contrast and reduce glare, making them suitable for a variety of outdoor activities.
Metal frames are also a popular choice for eyewear due to their durability and aesthetic appeal. The combination of metal frames and brown lenses can result in a stylish and versatile pair of sunglasses that can be used for both fashion and sun protection. If you have a specific question or need more information about such eyewear, please feel free to ask.