The Costa Del Mar Fisch sunglasses feature no-slip Hydrolite lining and our signature three-hole venting system on the front to keep things cool even when things heat up. Comfortable extra-large fitStainless steel integral hingeHeavy-duty TR 90 nylon frameIncludes hard case100% UV light blockage for max protection100% polarization kills reflected glare and reduces eye strainBuilt by hand and backed for life. Every pair of Costas include a lifetime warrantyPlastic lenses are lightweight, impact- and scratch-resistantGlass lenses have the greatest clarity and are scratch resistantPrescription ready