What is the thick, quilted layer of a turnout coat known as?

The thick, quilted layer of a turnout coat is referred to as the thermal barrier. This layer is specifically designed to provide insulation and retain body heat while protecting firefighters from extreme temperatures. It is made from materials that resist and reduce the transfer of heat, ensuring that firefighters can perform their duties in hazardous environments without suffering from heat-related injuries.

While other components of a turnout coat serve critical functions—such as the outer shell protecting against abrasion and moisture, or the moisture barrier preventing water penetration—the thermal barrier is crucial for maintaining a safe and manageable body temperature during firefighting operations. The reflective layer is typically used for visibility and doesn't contribute to thermal protection. Therefore, recognizing the purpose of the thermal barrier is essential for understanding the protective capabilities of firefighting gear.