This heavyweight Carhartt force base layer crew top for extreme cold weather Works as hard as you do to keep you warm, and dry on the coldest days. Smooth flat-lock seams and tag less label enhance comfort. Rugged flex fabric moves with you. Fast dry technology wicks away sweat and keeps you odor free throughout the work day. There's a convenient zip pocket on chest. The concealed thumb loops keep your sleeves in place when you put on another layer.