Costa Del Mar Mag Bay Sunglasses, Tortoise, Silver Mirror 580P Lens Comfortable Extra Large fit, Optical Spring Hinge. Heavy-duty TR 90 nylon frame, Includes hard case. 100% UV light blockage for max protection, 100% polarization kills reflected glare and reduces eye strain. 100% UV light blockage for max protection, 100% polarization kills reflected glare and reduces eye strain. Plastic lenses are lightweight, impact- and scratch-resistant.