What material is commonly used for fire-resistant clothing for firefighters?

The material commonly used for fire-resistant clothing for firefighters is Nomex or Kevlar. These fabrics are specifically designed to withstand high temperatures and provide excellent thermal protection. Nomex, for instance, is an aramid fiber that offers flame resistance, does not melt, drip, or support combustion, making it ideal for protective gear in firefighting. Kevlar is known for its high tensile strength-to-weight ratio, providing not only heat resistance but also durability and protection against cuts and abrasions.

In comparison, other materials listed, such as cotton or polyester, lack the necessary fire-resistant properties to be safe for use in high-heat situations. Cotton can ignite easily, and while polyester has some durable qualities, it can melt when exposed to flames. Nylon and wool also do not possess the same level of resistance to heat and flame as Nomex and Kevlar. Leather, while durable, does not provide adequate fire protection on its own, and rubber is primarily used for waterproofing rather than heat resistance. Thus, Nomex and Kevlar are the superior choices for ensuring safety and protection for firefighters in hazardous environments.