The terms Lyocell and TENCEL™ refer to the same material. TENCEL™ is the brand name of the Austrian company Lenzing AG. Lyocell, on the other hand, is the name given to the fiber. The basic building block of the fabric is wood from sustainable forestry. This is first produced from natural cellulose and then artificially processed. The fabric is biodegradable and represents a good, sustainable alternative to cotton or other man-made fibers.