This Heavyweight Carhartt Force® Poly-Wool Quarter-zip base layer top features temperature-regulating wool blend material to keep you warm, dry, and odor free on the coldest days. Smooth flatlock seams and tagless label enhance comfort. Rugged Flex® fabric moves with you. FastDry® technology wicks away sweat. There’s a convenient zip pocket on chest. The mock-neck collar with quarter length zipper unzips easily to release the heat when you’re working hard. The concealed thumb loops keep your sleeves in place when you put on another layer. Chest size: Small (34-36"), Medium (38-40"), Large (42-46"), X-Large (44-48"), 2X-Large (50-52"), 3X-Large (54-56"). Tall Sizes are 2" longer in sleeves and body than regular sizes.