What is a requirement for structural firefighting boots?

Structural firefighting boots are designed to provide maximum safety, protection, and performance in hazardous environments, making the requirement for a slip-resistant sole crucial. These soles help firefighters maintain traction on various surfaces, whether they are entering a burning building, navigating through debris, or working in wet conditions. A slip-resistant feature is essential because it greatly reduces the risk of slips and falls, which can lead to injuries during critical and often chaotic situations.

The other options may provide certain benefits, but they do not address the foundational need for safety related to movement and stability on potentially slippery surfaces, which is the primary function of the sole in firefighting boots. Understanding the specific requirements for such gear helps ensure that firefighters are adequately protected in the demanding environments they face.