The human body is an amazing source of heat. Don&&';;t waste it! Designed to capture your body&&';;s heat and put it to good use, the Source Heavyweight 1/4-Zip is the heaviest base layer top in the Badlands lineup. Pair your Source with a Badlands layering system (like the Source Heavyweight Bottom) and you&&';;ll be prepared for the nastiest weather that comes your way.