What is the term for the lower part of a protective hood?

The correct term for the lower part of a protective hood is "bib." In the context of firefighter protective equipment, the bib is designed to cover the neck and part of the shoulders, providing an additional layer of protection from heat, flame, and other hazards. This feature is crucial in ensuring that firefighters are adequately protected in environments where they might encounter extreme conditions or hazardous materials.

Understanding the term "bib" clarifies its purpose as part of the overall design of protective hoods, which are intended to shield the firefighter's head, neck, and ears. Each component of the hood, including the bib, plays a significant role in enhancing the wearer's safety and comfort while ensuring the most vulnerable areas are well-covered.

The other options, while related to aspects of protective gear, do not specifically refer to the lower part of the hood. The term "collar," for example, typically describes a different type of protective feature related to outer garments rather than a part of the hood itself.