UniFirst FR: This means the clothing brand is UniFirst. The FR stands for Flame Resistant. The fabric is specially made so it will not catch fire and continue to burn.ARC 2: This is a specific level of protection against electrical dangers. It means the pants offer moderate protection against electrical arc flashes. To get this rating, the fabric must pass safety tests showing it can block at least 8 calories of heat energy per square centimeter (8 cal/cm²). Who Wears This?People who work around active electrical gear, utility lines, or in factories usually wear ARC 2 clothing. It helps protect workers from sudden, extreme heat bursts and serious burns.

Otherwise, you may end up purchasing a pair of jeans that don’t fit.