Costa Fantail Polarized Sunglasses - Matte Black/Blue Mirror - These co-molded frames are a bit smaller, but definitely akin to the classic styling of our Blackfin frames. Adventure-ready? You bet. The 580G glass lenses are the clearest in the industry. Patented Costa technology blocks out yellow light for less reflection and better viewing through water. Color: Black Frame/Silver Mirror Lens Polarized Glass Hinge Type: Integral