The Men's Blocker Outdoors Koretec Heavyweight Top is a great cold-weather base layer. This Blocker Outdoors top features S3® silver antimicrobial technology that prevents odor buildup to keep you fresh all day long. The smooth polyester fabric and flatlock seams allow for easy layering, while the light fleece lining provides lightweight warmth. This Koretec base layer also features 4-Direction Stretch^TM material that allows a full range of motion with a comfortable fit. Great for chilly hunts and other outdoor pursuits, the Men's Blocker Outdoors Koretec Heavyweight Top will keep you warm and block odors for all-day comfort and freshness.