Firefighter 1C Wildland Practice Exam

Which material is recommended to be worn under the Nomex uniform?

1. 20% silk

2. 40% rayon

3. 100% nylon

4. 100% cotton

The correct answer is: 100% cotton

Wearing 100% cotton under the Nomex uniform is recommended because cotton is a breathable and comfortable fabric that helps wick moisture away from the skin. This moisture management is crucial in wildland firefighting, as firefighters often face high temperatures and physical exertion, leading to sweating. Cotton is a natural fiber and does not melt or drip when exposed to high heat, unlike synthetic materials. This characteristic is particularly important because it reduces the risk of burns that could be caused by molten fabric sticking to the skin during a fire situation. It provides an added layer of safety when worn under protective gear like Nomex, which is designed to withstand flames and heat. Other materials such as silk, rayon, and nylon have properties that can have negative implications when exposed to extreme heat. For example, rayon can ignite easily, and nylon can melt, both of which pose significant safety hazards for firefighters. Therefore, the recommendation to wear 100% cotton aligns with safety practices and comfort, making it the appropriate choice.