【Photochromic Lens】: The photochromic sunglasses darken and brighten according to the light conditions, they change from clear to gray in sunlight, effectively protecting your eyes while providing a comfortable viewing experience. No need to change glasses. 【UV400 Protection】: Thicken PC lenses with UV-Protective coating, shatterproof and scratch-resistant effectively, KAPVOE MTB glasses can defend against 100% of UVA/B/C rays and harmful blue light to 400nm, which can avoid avoid aging eye diseases and vision problems. 【Frame and Structure】: These photochromic mountain bike glasses are equipped with soft rubber nose pad and flexible TR90 frame provide a more comfortable fit, they suit different face shapes. 【Frame and Structure】: The air inlet design on the lens prevents fogging, reduces drag, increases riding comfort, and is suitable for high-speed riding. Convenient for you to configure glasses. Includes an inner frame accessory. Lenses are not included. 【Use Scenarios】: Designed for cycling, fishing, daytime driving and baseball and softball.