5210.31 - Plain weave:

This HTS category, 5210.31, specifically encompasses plain weave woven fabrics of cotton. These fabrics must contain less than 85% cotton by weight, with man-made fibers being the primary or sole other component. Furthermore, these fabrics are limited to a weight not exceeding 200 g/m². The defining characteristic of this group is their "dyed" status, meaning the fabric has undergone a coloring process prior to presentation.

Distinguishing this category from its siblings, 5210.32.00.00 covers fabrics with a 3-thread or 4-thread twill weave, including cross twill. Category 5210.39, on the other hand, is a broader "other fabrics" designation for plain weave dyed cotton fabrics that do not fall into the specific subdivisions outlined below. Therefore, 5210.31 is specifically for plain weave, dyed cotton fabrics that are not twill and not covered by further specific subdivisions.

Within HTS 5210.31, further subclassification is determined by the yarn count. The subcategories 5210.31.40, 5210.31.60, and 5210.31.80 differentiate these fabrics based on whether their yarn count is 42 or lower, between 43 and 68, or 69 or higher, respectively. This meticulous subdivision allows for precise classification based on the fineness of the yarn used in the construction of the fabric.