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Brand: SCVCN Photochromic cycling glasses Classic frame design, versatile and effortless Lightweight and stylish for everyday use Please note! This product only has a single pair of glasses, no glasses case glasses cloth and other accessories！. 【Features】Stylish design, light and flexible, suitable for more face shapes. Lightweight design is perfect for motorcycles and bicycles, driving, fishing, walking, climbing, hiking or other outdoor activities 【Lens introduction】Photochromic lenses have UV400 function and will change color under direct sunlight. Discoloration occurs in about 1 minute in winter and about 40 seconds in summer. Speed depends on sunlight and UV intensity! (If the UV intensity and temperature are low, the color change rate will be slower.) The color change rate is related to the UV intensity and temperature.