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The Smith Approach interchangeable lens system creates a sleek and subtle design allowing unobstructed peripheral view perfect for biking as well as everyday eyewear protection. Smith's Interchangeable lens system utilizes distortion-free, 9 base curvature Carbonic TLT lenses to provide precise optical clarity and maximize coverage while minimizing peripheral exposure to sun, wind, and glare. The medium fitting Evolve frame features Megol nose and temple pads that provide a secure fit so your shades don't slip. Includes clear, ignitor and red mirror replacement lenses that swap out easily when conditions call for it.