Final answer:
The four basic parts of a motorcycle helmet are the outer shell, impact-absorbing liner, comfort padding, and retention system.
Step-by-step explanation:
The four basic parts of a motorcycle helmet are:
Outer Shell: The outer shell of a motorcycle helmet is usually made of a hard and durable material, such as polycarbonate or fiberglass. It provides protection against impact and external objects.
Impact-Absorbing Liner: Inside the outer shell, there is an impact-absorbing liner, usually made of expanded polystyrene (EPS) foam. This liner is designed to cushion the head and absorb the energy from an impact, reducing the risk of brain injury.
Comfort Padding: Motorcycle helmets have comfort padding inside to provide a snug fit and enhance comfort for the wearer. This padding is usually made of soft, moisture-wicking materials like foam or fabric.
Retention System: The retention system, commonly known as the chin strap, secures the helmet on the wearer's head. It ensures that the helmet stays in place during a potential impact and prevents it from coming off.