Chicago Protective Apparel CX-55 Series CarbonX pants are designed to protect the lower portion of the body from hazards, including direct flames, extreme heat, molten metal splashes, hot / flammable liquids and arc flash incidents. These pants are crafted from CarbonX, a unique and cutting-edge non-flammable fabric composed of specially treated fibers derived from oxidized polyacrylonitrile. This technology gives the fabric its inherent flame-resistant properties, making it capable of withstanding extremely high temperatures.