Which component of structural turnout coats protects the body from steam burns?

The component of structural turnout coats that protects the body from steam burns is the moisture barrier. This layer is crucial in firefighting gear as it prevents moisture, which can turn into steam due to the intense heat of a fire, from penetrating through to the skin. If steam were to come into contact with the skin, it could cause severe burns. By effectively blocking this moisture, the moisture barrier helps maintain a safer environment for firefighters, allowing them to work more effectively and with reduced risk of injury from steam and hot liquids.

The other layers of the turnout coat serve different functions. The outer shell is primarily designed to provide abrasion protection and resist flame and heat. The insulation layer contributes to thermal protection but is not specifically geared towards moisture management. The thermal layer focuses on keeping the firefighter warm, but without the moisture barrier, steam and water could still reach the firefighter, compromising safety.