A bicycle helmet is a protective headgear designed to reduce the risk of head injuries during cycling. It is typically made from 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 bicycle helmet is often recommended or required by law in many places, especially for children. Proper fitting is crucial; the helmet should sit level on the head and not move when shaken. Regularly checking for damage and replacing old helmets can enhance safety while cycling.