This pair of day-and-night cycling glasses is specially designed for outdoor sports enthusiasts and is suitable for various scenarios such as traveling, outdoor sports, cycling, and driving. It features a full-frame structure, providing a stable wearing experience. The lenses have a photochromic function, which can automatically adjust according to different light conditions. Whether it's the strong sunlight during the day or the relatively dim light at night, they can offer you a clear field of vision, truly enabling day-and-night use. The transmittance classification of these glasses is Class 2 sunglasses. Although they are not polarized glasses, their anti-UV level reaches UV400, effectively blocking the damage of ultraviolet rays to your eyes and providing reliable protection for your eyes. Meanwhile, they have excellent windproof performance. During high-speed sports like cycling, they can prevent sand and dust from blowing into your eyes, allowing you to focus on the sport. These glasses are sized to fit most people, so you don't have to worry about wearing issues. They can bring you a comfortable and safe experience in various outdoor scenarios.