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Carhartt men don’t just need quality pants, shirts and boots for their rugged work days. They also need underwear that overachieves. With features like lightweight durability, smooth flatlock seams, tagless labels, FastDry® with 37.5™ technology that wicks away sweat and is scientifically proven to give you more stamina, Rugged Flex® technology that moves with you and odor fighting elements, you are sure to be comfortable in our men’s thermal underwear no matter how hard or long your work day ends up. With two different styles, boxer and the more fitted boxer brief, our thermal underwear for men has your underside comfortably covered.