Details: This is heavyweight like ali-frazier. Heavyweight like a left tackle on fourth and goal. This bottom is for hard-working guys who work in the trenches. Made of 8-ounce, 95-percent polyester/5-percent spandex heavyweight knit, it’ll keep you warm. You’ll be happy to know it wicks away sweat and fights odors. It has smooth flat-lock seams for the warmth and comfort you demand and an elastic waist. Goes great with the base force super-cold weather crewneck top the way chili goes with fries.