PHOTOCHROMIC LENS-Based on the intensity of sunlight and ultraviolet lights, darkening the light grey lens. Absorb 100% of UV light and eliminate 99% glare light. HD POLARIZED VISION LENS-The polarized lens is 100% UV400 protection coating, blocks 100% harmful UVA & UVB Rays and protect eyes perfectly AL-MG METAL ALLOY-Lightweigh,great to wear for long periods of time.Suitable for long wear.Added up with soft silicone nose pads,ensure that you can stay at comfortable and safe at outdoor activi