Generic helmets" (referring to typical helmets across various activities, not a brand name) share several core features focused on safety, fit, and comfort. Key elements include a protective shell, an impact-absorbing liner, a secure retention system, and ventilation.

Core Safety & Construction Features

Outer Shell: Made of durable, high-quality materials such as polycarbonate, fiberglass, or carbon fiber composites, the outer shell is the first line of defense, designed to resist abrasion and impact penetration.

Impact-Absorbing Liner: Inside the shell is a thick layer of Expanded Polystyrene (EPS) foam. This liner is crucial for absorbing and dispersing the energy of an impact, reducing the risk of brain trauma.

Safety Certification: Helmets must meet or exceed specific safety standards, such as DOT (US Department of Transportation), ECE (Europe), CPSC (US for cycling), or Snell, which ensure they have been rigorously tested for impact protection.

Retention System: A sturdy chinstrap with a reliable fastening device (often a quick-release buckle) ensures the helmet stays firmly in place during use and in the event of a crash.