With the Projob 3101 thermal undershirt, you stay warm and comfortable during demanding physical tasks in cold environments. The lightweight 135 g/m² polyester fabric provides efficient thermal insulation while quickly wicking moisture away from your skin to keep your body temperature balanced. Built with raglan sleeves and a seamless torso design, it eliminates friction points and delivers full freedom of movement throughout your workday. The snug fit in men's size L features an extended back and knitted cuffs, keeping this black base layer firmly in place whenever you bend or reach. An essential first layer under your workwear jacket or overalls.