As a type of rayon, modal is a semi-synthetic cellulose fiber made by spinning reconstituted cellulose, often from beech trees. Modal is used alone or with other fibers (often cotton or spandex) in house wear items like pajamas, towels, bathrobes, and underwear and bed sheets.

Modal is processed under different conditions to produce a fiber that is stronger and more stable when it is wet than standard rayon, yet has a soft feel, similar to cotton.