Key components:

• Shell: The outer layer, typically made from heat-resistant materials like fiberglass or thermoplastic, provides primary protection against impact and heat.  
• Suspension system: An inner liner that distributes impact forces and helps to absorb shock.
• Face shield: A transparent visor that protects the face from heat, flames, and debris.  
• Chinstrap: A strap that secures the helmet to the head.  
• Accessories: May include ear protection, headlamp mounts, and communication devices

Functions:

• Protection: Shields the head from impact, heat, flames, and falling debris.
• Visibility: Bright colors enhance visibility in smoky conditions.
• Communication: Often integrated with communication systems.  
• Comfort: Designed to be comfortable for extended wear.