Lycell is a generic term for wood pulp fiber, and TENCEL is a brand of Lycell fiber.
Lycell fiber is a generic term for regenerated lignocellulosic fibers, so the concept of Lycell fiber is broader. TENCEL originally referred to Lenzing Lysol fiber, commonly known as Lenzing TENCEL or simply TENCEL. But because of the Tencel catchy and memorable, people will be called Tencel Leisel fiber, and even have a domestic Tencel this title, but this call is not standardized. Strictly speaking, Leisel fiber represents a textile raw materials category, like cotton, hemp, silk, wool, polyester, brocade, viscose, acetic acid, acrylic and other concepts, is the collective name of the regeneration of wood fibers. Tencel is a product line of Lycell fibers, specifically the Lycell fibers produced by Lenzing, so Tencel is actually Lenzing Lycell fibers!