On a practical level though, it's made of TENCEL™ Modal and Recycled Polyester. Whichever one's more important to you though, we can't wait for you to feel it in this half zip.
46 % TENCEL™ Modal, 47 % Recycled Polyester, 7 % SpandexDisclaimer: Wash garment with like colors, inside out. Water droplets can easily mark this fabric, however, a simple wash will remove these markings.