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Frame Material : ALLOY Lenses Material : Polaroid Gender : WOMEN Eyewear Type : Sunglasses Item Type : Eyewear Lenses Optical Attribute : UV400,Polarized,Photochromic Frame Material : Alloy Department Name : Adult Lens Height : 40mm Lens Width : 65mm UV 400 Protection: The sunglasses block all three ranges of ultraviolet radiation: UVA, UVB and UVC and protect the human eye 100% from harmful effects of the sun rays. Photochromic Polarized lenses: The lenses reduce irritating reflections and glare caused by light reflected from surfaces such as water, road, sand or snow. They absorb 100% of UV light and eliminate 99% glare light. Note Due to different producing batches, product details might be a little different. If you minding the difference, please buy it carefully. Please allow 1-3mm differs due to manual measurement. Due to the different display and different light, the picture may not reflect the actual color of the item. Thanksfor your understanding. Package includes: 1 Pcs sunglasses The revolutionary new sunglasses with built-in Photochromic  Technology. These unique lenses respond to changing lighting conditions almost instantly! Lenses automatically darken on bright light and lighten on low light. This effect is achieved by the photochromic lenses in our glasses.  Main Features :1.UV400 PROTECTIONOur sunglasses block all three ranges of ultraviolet radiation: UVA, UVB and UVC and protect the human eye 100% from harmful effects of the sun rays. This is achieved by a multi-layer lens design for optimal eye protection. 2.POLARIZEDWhile most glasses only offer UV-A and UV-B protection, we go the extra mile by also polarizing our lenses. Polarization helps reduce strain on your eyes, increases visual comfort and more importantly, it dramatically increases visual clarity by reducing glare. In addition to all this, you can experience the world in brilliant colors and with more contrast than ever before! Discoloration Principle This glasses lens is contain discoloration factor, it will occur chemical reaction under the ultraviolet radiation. When the sun changes strongly, the lens color will be dark gradually and it will absorb ultraviolet rays at the same time. But when their is no sun light , the glasses lens will be back to original color.

3.Lightweight Our frames are made of Aluminum and Magnesium which are known for their extreme strength while being lightweight.