Anti-Fog and Uv Protection: Advanced anti-fog coating ensures clear underwater vision. Mirrored outer coating provides Uv protection for indoor and outdoor swimming. Super Clarity: Uv400 lenses block Uv rays and eliminate reflected light for true-color vision. Ideal for swimming and water sports. Leak-Free Design: Soft silicone seals conform to any face shape, preventing leaks and minimizing eye pressure for a secure fit. Crystal Clear Vision: Double protection with interior anti-fog coating and exterior UV filter for safe sun swimming. Comfort Fit: Soft elastic silicone headband with adjustable quick-release design for perfect fit in seconds. Weight: 0.35 pounds.