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·Fire-retardant sweaters are protective underwear used by firefighters to keep warm during fire fighting operations in cold climates. They also have certain thermal insulation properties. The flame-retardant sweater is made of flame-retardant material and is made of flame retardant, warm, light and comfortable. The shoulder and elbow mounts have a thick, strong flame retardant lining to enhance the abrasion resistance and strength of the flame retardant sweater.