Comfortable large fit.Stainless steel spring hinge.Durable co-injected nylon frame.Includes hard case.100% UV light blockage for max protection.100% polarization kills reflected glare and reduces eye strain.Built by hand and backed for life. Every pair of Costas include a lifetime warranty.Plastic lenses are lightweight, impact- and scratch-resistant.Glass lenses have the greatest clarity and are scratch resistant.Built by hand and backed for life. Every pair of Costas include a lifetime warranty.Plastic lenses are lightweight, impact- and scratch-resistant.Glass lenses have the greatest clarity and are scratch resistant.