Learn more about Costa Sunglasses Built to match your adventures, the extra-large Costa Mag Bay 580G Polarized Sunglasses are ready to become part of your greatest tales. Blending style with performance, the Costa Mag Bay 580G Polarized Sunglasses sport 100% polarization that ends reflected glare and reduces eye strain for an unmatched visual experience. Adding to the lenses technology is 100% UV light blockage for superior protection from the suns rays, while a lightweight build makes the lenses impact- and scratch-resistant. The heavy-duty TR-90 nylon frame keeps these handcrafted Costa sunglasses in top shape wear after wear. Prescription-ready for a truly custom fit. Manufacturers limitedlifetimewarranty. About your Costa lenses: Blue Mirror Encapsulated mirrors deliver superior contrast and color in full sun and eliminate glare (gray base). Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Polarized.