1. This pair of day-and-night cycling glasses is designed for outdoor sports enthusiasts and suitable for various scenarios such as traveling, outdoor sports, cycling, and driving. 2. It adopts a full-frame structure, providing a stable wearing experience. The lenses have a photochromic function and can automatically adjust according to different light conditions. Whether it is the strong sunlight during the day or the relatively dim light at night, it can provide you with a clear view, truly achieving day-and-night use. 3. The light transmittance classification of these glasses belongs to category 2 sunglasses. Although they are not polarized glasses, their UV protection level reaches UV400, which can effectively block the damage of ultraviolet rays to the eyes and provide reliable protection for the eyes. At the same time, they have excellent windproof performance. During high-speed sports such as cycling, they can prevent sand and dust from blowing into the eyes, allowing you to focus on the sport. 4. The size of these glasses is suitable for most people, so you don't have to worry about wearing them. They can bring you a comfortable and safe experience in various outdoor scenarios.