How has helmets been changed over the years?

Over the years, helmets have evolved significantly in terms of materials, design, and technology. Early helmets were often made of heavy metals or hard plastics, offering limited protection and comfort. Modern helmets now utilize advanced materials like polycarbonate and expanded polystyrene, which provide better impact resistance while being lighter and more comfortable. Additionally, innovations such as MIPS (Multi-directional Impact Protection System) have been integrated to enhance safety by reducing rotational forces during impacts.