These are one - piece sports sunglasses with a TR90 frame and UV400 protection. The TR90 frame is both lightweight and durable, making it comfortable for long - term wear. The UV400 feature blocks out harmful ultraviolet rays, which is great for outdoor activities. With their one - piece design, they have a stylish appearance. They are perfect for various sports and outdoor use, especially cycling. As a high - quality item in the sports accessories category, these sports sunglasses are a great choice for those who love sports and the outdoors.