Modal is a type of rayon, a semi-synthetic cellulose fiber made by spinning reconstituted cellulose, in this case often from beech trees. Modal is used alone or with other fibers (often cotton or spandex) in household items such as towels, bathrobes, underwear and bed-sheets.
Manufacturers claim a number of advantages for the fiber:
It is also claimed that mineral deposits from hard water do not stick to the fabric surface. It is smooth and soft, more so than mercerized cotton, though some perceive it to have a synthetic texture. Modal fabrics should be washed at lower temperatures and, like cotton, are often ironed after washing.