Ready for action, the Tifosi Elder sunglasses are perfect for long runs and bike rides, but stylish enough to wear on rest days around town. . . . . . . . Grilamid TR 90 frame offers an extremely high alternative bending strength, low density, and high resistance to chemical and UV damage. Includes three sets of lenses:. Smoke lenses provide 15.4% L.T. light transmission, show the least amount of color distortion, and are perfect for full sun conditions. AC Red lenses provide 41.4% L.T., offer an enhanced view in cloudyfoggy weather, and provide good contrast in mid to lowlight conditions. Clear lenses provide 95.6% L.T. and allow the user to have eye protection at night or in other extreme lowlight conditions. Lenses are made of scratch resistant, shatterproof polycarbonate. Lenses are vented for increased air circulation to prevent fogging and keep you cool. Hydrophilic rubber nose pad and earpieces ensure a non slip fit. Adjustable nose pads allow for customizable comfort. All Tifosi sunglasses provide 100% UVAUVB protection. Fits medium to extra large faces.