Gunnar Optiks G004-C001 Catalyst Metal Marley Digital Performance Eyewear with i-AMP Lens Technology (Onyx) DiAMIX lens material - a custom blended proprietary polymer, which beats out polycarbonate on the toughness scale FRACTYLlens geometry - custom designed to provide focusing power that eases eye strain. I-FIlens coatings  anti-glare coatings that filter out harsh artificial reflected light. IONIK lens tint - Specially formulated tints condition and shift the color spectrum to provide superior contrast Frame Design - built for visual endurance, GUNNAR frame systems are engineered for optimal weight, comfort and durability.