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The Carhartt Mens Base Force Lightweight thermal bottom is our lightest weight long underwear for cool weather. This 135 gsm/4 oz 100% polyester works as hard as you do to keep you warm, dry, and odor free throughout the work day. Smooth flat-lock seams and tag less label enhance comfort. Rugged flex fabric moves with you for unlimited movement on the job and fast dry technology wicks away sweat keeping you dry. Brushed Y-split waistband elastic with concealed stitching for comfort and contoured front panel with fly supports and provides comfort where you need it. Great for cool days or for guys that run hot but need a little extra warmth on those colder days.