Step into the future of optical technology with ray-ban rb3721. These square-shaped glasses features a polished black on black metal frame that exudes a timeless appeal. The classic design is complemented by the dark grey lenses, which offer superior protection from harmful sun rays and provide an excellent choice for everyday wear. The standard shape and size make these shades versatile enough to suit any style preference. With ray-ban rb3721, you can enjoy both fashion and functionality in one stylish package.