Arc flash and flame-resistant clothing protects workers from burn injuries in areas with sparks, open flame, and other potential fire hazards. Also called FR clothing, this protective clothing resists ignition and helps insulate against heat. Flame-resistant garments are made of materials that naturally resist burning or melting. Flame-retardant garments that are chemically treated to self-extinguish. Arc flash protection garments are a specialized flame-resistant clothing worn when working near electrical equipment where arc flash hazards exist. Aluminized clothing reflects radiant heat to help maintain a safe body temperature.