Luxury Watches for Men and Women at Discount Prices Buy Costa del Mar Costa Del Mar Isabela Polarized Green Mirror Glass Sunglasses IB 128 Costa Del Mar Isabela Copper Polarized Polycarbonate Ladies Sunglasses Costa Del Mar Isabela Women's Polarized BIFOCAL Sunglasses Tortoise Joseph's Clothier Costa Del Mar Isabela Plastic Polarized Lenses Costa Del Mar Isabela Sunglasses Black Coral Gray 580P. 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.