Specifically designed to fit Ray-Ban Meta Headliner (Gen 2) RW4013 50mm, as marked on the inside of the temple arm.HD Polarized Ultra - Ultimate Performance, Maximum Protection Our top-of-the-line lens, delivering excellence in every dimension. With unmatched clarity, contrast, and durability, it's the first choice for high-intensity outdoor sports and extreme visual demands. Ideal for: Trail running, surfing, mountain biking, snow sports. HD Polarized Plus - Built to Last, Made for the Elements Combining advanced polarization with exceptional wear and corrosion resistance, this lens is perfect for long-term use in harsh environments like the seaside or deserts. Ideal for: Coastal activities, fishing, boating, desert trekking. HD Polarized - Everyday Balance, Proven Quality Our most popular model. It offers reliable polarized protection, crisp optics, and strong value for daily outdoor use. Ideal for: Commuting, hiking, driving, daily wear. Photochromic - Smart Light Adaptation, All-Day Comfort These lenses automatically adjust to changing light, ensuring consistent clarity and UV protection from dawn till dusk. Ideal for: All-weather travel, cycling, trail walking, changing light conditions. Non-Polarized - Pure Optics, Professional Flexibility Designed for scenarios where polarized light may interfere with performance, like photography or dense forest walks, while still offering sharp vision and impact protection. Ideal for: Photographers, forest trails, low-light environments.