5205.12 - Exceeding 14 nm but not exceeding 43 nm:

This HTS classification covers single yarns of uncombed cotton fibers, specifically those containing 85 percent or more by weight of cotton and not packaged for retail sale. The defining characteristic of this category is its yarn count, measured in "nm" (English cotton count), which signifies the number of 840-yard hanks per pound.

Within the broader classification of single, uncombed cotton yarns (5205.1), this particular node, 5205.12, is distinguished by its specific yarn count range. It differentiates itself from sibling categories such as 5205.11 (not exceeding 14 nm), 5205.13 (exceeding 43 nm but not exceeding 52 nm), and others that cover finer or coarser yarns. Therefore, yarn intended for classification here must fall strictly between exceeding 14 nm and not exceeding 43 nm.

The subcategories under 5205.12 provide further refinement based on the treatment of the yarn. 5205.12.10.00 specifically addresses unbleached and not mercerized yarns, which are typically in their natural state after spinning. In contrast, 5205.12.20.00 encompasses "other" yarns within this count range, which would include those that have undergone bleaching, mercerization, or other finishing processes, broadening the scope to cover a wider array of treated cotton single yarns within the specified count.