The Thermal Underwear Set is perfect for those long, cold, winter days. This men's tagless 60% cotton and 40% polyester thermal underwear has an elastic waist band and comfortable ribbed cuffs and leg openings. The Workwear underwear features a droptail hem that keeps the back tucked in, and provides added coverage. This thermal underwear set is just the thing you need for that added layer of warmth.