This chic pair of sports glasses is an ideal optimization result for cycling, driving, running, fishing, racing, skiing, climbing and other outdoor activities enthusiasts. Made from high quality polycarbonate material, it has three functional shatterproof Interchangeable lenses: multi-color, crystal, and silver. Besides, it can also be used as prescription glasses. Please remove the original lens away before installing your prescription frames, or refer to the User Guide for more information about installation.