For an effective flame resistant clothing program, every layer of protection matters, including the layer closest to your skin. In a flash fire or electric arc event, heat can pass through outer layers and reach your undershirt, which is why wearing a flame-resistant base layer is essential. It removes the risk of meltable fabrics, adds a second layer of protection and increases overall comfort throughout the workday. Big Bill flame-resistant base layers are inspired by performance wear, designed to wick sweat away from the body to help keep workers cool and dry in demanding environments. Our collection includes flame-resistant t-shirts, quarter zip tops and thermal underwear that offer full mobility for reaching, bending and stretching without riding up or restricting movement. Every garment is tested to high industry standards and delivers reliable arc-rated protection for the life of the product. Layer them under your flame-resistant shirts or outerwear for added safety, comfort and peace of mind on the job.