2.Anti-UV Ultraviolet: these goggles have anti-UV function to prevent bright light from burning your eyes and protect your eyes. The goggles are durable with anti-shock and anti-drop function. 1.ANTI-FOG EFFECT: This swimming goggles will not create fog on the mirror surface due to the change of underwater temperature when you are doing underwater sports, which ensures a clear vision in the water and allows you to watch the underwater world freely.