AF Heat Shield PantAction Factory Heat Shield Long Underwear Pant Action Factory has designed them in house for the stunt professional that works in and around fire. You will find that our long underwear is designed with safety and protection in mind. The unique design of our heat shield pants allows the user a choice between a stocking foot or a cuff by simply keeping the garment whole or cutting away the undesired portion. The pant waist comes up high to the belly