Lenses made of LightWAVE® glass Co-injected temples 100% polarized100% UV protection The Costa Fathom 400 Sunglasses deliver unbeatable function, fashion, and value, all in one package! Fathom Sunglasses feature Costa's innovative Hydrolite® construction with cold-molded frames for the perfect fit; three vents on each side for cool comfort; co-injected temples. In addition to the perfectly fitting, stylish frames, every pair of Costa's Fathom 400 Sunglasses is 100% polarized, 100% UV protected and offers heightened clarity, contrast and definition. LightWAVE glass lenses are 20% thinner and 22% lighter than typical glass lenses but they still exceed federal standards for impact-resistance. About your Costa lenses:Blue Mirror for bright sun, offshore fishing, and most water sports. Green Mirror for variable sun conditions, inshore and offshore fishing.