Sun visors are adjustable panels found in vehicles, designed to block sunlight and reduce glare for drivers and passengers. Typically made of fabric or plastic, they can be flipped down or extended to shield the eyes from direct sunlight, enhancing visibility and safety while driving. In addition to cars, sun visors are also used in other settings, such as airplanes and bicycles. They come in various styles and sizes, often featuring mirrors for added convenience. Some sun visors even include additional features like built-in lights or storage compartments for small items.