Crash helmets, also known as motorcycle helmets or bicycle helmets, are protective headgear designed to reduce the risk of head injuries during accidents. They are made from durable materials like polycarbonate or fiberglass and feature a foam inner lining that absorbs impact energy. Properly fitted helmets can significantly decrease the severity of injuries in case of a fall or collision. These helmets come in various styles, including full-face, open-face, and half helmets, catering to different activities and preferences. Many countries have laws requiring the use of crash helmets for riders of motorcycles and bicycles, emphasizing their importance in promoting safety on the road.