Carhartt Force® Super Cold Weather Base Layers. Huge warmth, with a moisture-wicking edge! It may be cold on the job, but that doesn't mean you won't perspire. Designed for men who work up a sweat even in frigid temps, this Carhartt Force Super Cold Weather Thermal Underwear Shirt is the ultimate choice for comfortable layering. Featuring FastDry® moisture-wicking technology and odor-fighting properties to keep you feeling fresh. The extra-long droptail offers added coverage and the rib-knit cuffs seal in warmth. Plus, Smooth flatlock seams provide no-chafe comfort.