Costa Fernandina Sunglasses Costa Del Mar Sunglasses: Made in the USA Carytown Optical Costa Del Mar Polarized Sunglasses, Fisch 64P TORTOISE BROWN GREEN Costa Fernandina Polarized Sunglasses Rose Gold Copper Silver Adult Costa Fernandina Del Mar Collection Sunglasses FramesDirect.com Del Mar Collection Sunglasses Costa Del Mar US. 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.