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Moisture Barriers
The primary purpose of the moisture barrier is to protect the firefighter from water and what NFPA refers to as the "common liquids": chlorine, battery acid, aqueous film-forming foam, gasoline, hydraulic fluid, and antifreeze fluid. Then it is additionally tested for blood-borne pathogens. The other purpose of the moisture barrier is to allow perspiration to move away from the wearer, also referred to as "breathability."