Built for all day adventures, Tifosi Duro sunglasses with interchangeable lenses are perfect for everything, whether you're running a 10k, riding a century, or heading out for a kayak fishing trip.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 cloudy/foggy 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. Optically decentered lenses eliminate distortion and prevent distracting magnification. 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 temples and nose allow for customizable comfort. All Tifosi sunglasses provide 100% UVA/UVB protection. Fits medium to large faces.