Del Mar Collection Sunglasses Costa Del Mar US Amazon.com: Costa Del Mar Men's Fernandina Aviator Sunglasses Costa Del Mar Fernandina Sunglasses Shiny Rose Gold Silver 580G Costa Fernandina Polarized Sunglasses Sportsman's Warehouse Costa Del Mar Fernandina Copper Polarized Glass Ladies Sunglasses FER Costa Fernandina Del Mar Collection Prescription Sunglasses. 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.