Costa Del Mar Sampan Men's Rectangular Sunglasses Matte Black Frames Costa Del Mar Men's Sampan Polarized Rectangular Sunglasses, Matte Costa Del Mar Sampan Men's Rectangular Sunglasses Matte Tortoise Costa Del Mar Men's Sampan Polarized Rectangular Sunglasses, Matte. 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.