These co-molded frames are a bit smaller, but definitely akin to the classic styling of the Costa Blackfin frames. Adventure-ready? You bet. Costa 580 lenses use patented lens technology to cut down on the yellow light, allowing the eye to see more red, blue, and green. Simply put, they're the most advanced glare-beating polarized sunglass lenses on the planet, and they'll change the way you see, period. The yellow light near 580 nanometers is particularly difficult for the eye to process, so these polarized sunglasses block it, which offers sharper contrast, better definition, and enhanced colors in any environment. Medium fit with medium coverage. Tortoise frame with green mirror lenses. Made in USA.