The fire retardant sweater, professionally known as the firefighter's flame retardant sweater or fire-resistant thermal underwear, is an important part of the firefighter's personal protective equipment system. It is not an ordinary sweater, but a professional base layer clothing made of permanent flame retardant fibers, specially designed for firefighters operating in cold environments. Its main function is to provide the necessary warmth while ensuring extremely high safety and preventing the clothing from burning or melting in high temperature environments, which can cause secondary injuries.
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