manufactured fibers sit within three categories: manufactured cellulosic fibers, manufactured synthetic fibers and manufactured protein fiber (azlon). manufactured cellulosic fibers include modal, lyocell (also known under the brand name tencel), rayon/viscose made from bamboo, rayon/viscose made from wood and polylactic acid (pla). manufactured synthetic fibers include polyester, nylon, spandex, acrylic fiber, polyethylene and polypropylene (pp). azlon is a manufactured protein fiber.