A bike helmet is a protective headgear designed to reduce the risk of head injuries during cycling. It typically consists of a hard outer shell and an inner foam layer that absorbs impact. Helmets come in various styles and sizes to fit different head shapes and preferences, ensuring comfort and safety for riders of all ages. Wearing a bike helmet is often recommended by safety organizations and is required by law in some areas. Proper fitting is essential for effectiveness, as a helmet that is too loose or too tight may not provide adequate protection. Regularly checking for damage and replacing old helmets is also important for maintaining safety standards.