This heavyweight Carhartt force base bottoms for extreme cold weather Works as hard as you do to keep you warm, dry, and odor free on the coldest days. The heavyweight fabric traps heat and features rugged flex That moves with you and fast dry technology to wick away sweat. They feature smooth flat-lock seams and key-split elastic waistband with concealed stitching for comfort. The contoured front panel with fly supports and provides comfort where you need it.