Editing Denim (section)

===Yarn production===
Traditional denim yarn is composed entirely of [[cotton]]. Once cotton fibers are cleaned and combed into long, cohesive lengths of similar-length fiber, they are [[yarn#spun yarn|spun]] into [[yarn]] using an industrial machine. Throughout the creation of denim, washes, dyes, or treatments are used to change the appearance of denim products.

Some yarns may substitute an [[Elastomer|elastic component]] such as [[spandex]] for up to 3% of the cotton, the woven form of which (typically called 'stretch denim') may have a [[elasticity (physics)|elasticity]] of up to 15%.