【SPECIAL PHOTOCHROMIC DESIGN】 This photochromic lens are based on the intensity of sunlight and ultraviolet light, darkening the light grey lens. What’s more, these sunglasses protect the eyes without interfering with your perception of color. Plus its fashion rectangular design, always match your daily dressing demand(may not change very obviously under weak UV conditions) | 【UV400 POLARIZED PROTECTIVE LENS】 These sunglasses are superior to the regular type of sunglasses in three ways - when moving indoors or outdoors, the lenses adjust to the reduced light conditions automatically. And secondly, the polarized lenses reduce flare and glare. Meanwhile, 100% UV protection layers against harmful UVA/UVB Rays | 【USAGE OCCASIONS】 Photochromic looking sunglasses can do a good job of stopping the dazzling effects of sunlight when you are driving, running, fishing, biking or other outdoor activities. Keep your safety always by your side | 【SPECIFICATIONS OF SUNGLASSES】 Temple Length: 5.20in, Lens Height: 1.61in, Lens Width: 2.68 in, Bridge: 0.51in, Frame Material: Al-Mg | 【RISK-FREE SHOPPING EXPERIENCE】The Photochromic lenses only change color under ultraviolets, and may not change very obviously under weak UV situations, people will have different visual senses. Customers’ full satisfaction are always our primary goal. If you have any problems about our products, please never be hesitated to contact us, we’ll try our best efforts to improve the situation