A helmet visor is a protective shield attached to a helmet, designed to cover the face and eyes. It is commonly used in various activities, including cycling, motorcycling, and sports like football and hockey. The visor helps to shield the wearer from wind, debris, and harmful UV rays, enhancing visibility and safety. Visors can be made from materials like polycarbonate or acrylic, which are lightweight and impact-resistant. Some visors are tinted to reduce glare, while others are clear for maximum visibility. Many modern helmets come with adjustable visors, allowing users to customize their fit and protection based on their needs.