Costa Del Mar Fantail Polarized Sunglasses - Blackout/Blue - Always ready to hit the flats or hook a deep-sea behemoth, the Costa Fantail sunglasses are the smaller but no less mighty kin of the Blackfin. The best polarized sunglasses on the water, these men's performance sport fishing sunglasses with mirrored options are polarized, co-molded and are perfect for any Angler. The Costa sunglasses ‘fit' guide is a range from Narrow, Regular to Wide with most people choosing Regular. Fit is a combination of both the size of the sunglasses and the features of the frame, together. The features of our sunglasses influence the way the sunglasses fit, like the hinges and temple construction. Use the ‘fit' guide to select a Costa sunglass frame that will be comfortable and perform for you.