Features:• Comfortable large fit.• Stainless steel spring hinge.• Frame made of super tough, corrosion resistant alloy material- Monel®.• 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.