Made with LENZINGâ„¢ ECOVEROâ„¢ viscose, this long-sleeve mock-neck is not only amazingly soft, it's also botanical in origin and sustainable. The fabric is blended with spandex for stretch comfort.LENZINGâ„¢ ECOVEROâ„¢ is a sustainable form of viscose (rayon). Like generic viscose, ECOVERO is derived from the natural cellulose in trees. In addition, Lenzing only uses wood from responsibly managed forests, and their manufacturing processes generate lower emissions, and consume less fossil resources and water than generic viscose. LENZING ECOVERO is certified with the EU Ecolabel to have a significantly lower environmental impact throughout its lifecycle-from raw material extraction through production, distribution, and disposal.Models shown are 5'9" to 5'11" tall, wearing size S/4 or L/12.