What is the third layer in the pants and coat ensemble in firefighting gear?

In firefighting gear, the third layer in the pants and coat ensemble is the thermal liner. This layer is crucial because its primary function is to provide thermal insulation to protect firefighters from extreme heat during firefighting operations. It retains body heat, ensuring that firefighters remain protected from the intense temperatures encountered in a fire environment.

The thermal liner is typically made from materials designed to resist degradation from heat, and it can contribute significantly to the overall effectiveness of the protective ensemble. By minimizing heat transfer to the firefighter's body, the thermal liner plays an essential role in maintaining safety and comfort during firefighting tasks.

While options like the moisture barrier and the shell layer are also important components of firefighting gear, they serve different functions. The moisture barrier protects against water and contaminants, while the shell layer provides durability and resistance to abrasions and external hazards. In contrast, the thermal liner is specifically focused on insulation and heat protection, making it the defining third layer in the ensemble.