5101.21.30.00 - Other wool, finer than 40s but not finer than 44s

This HTS classification, 5101.21.30.00, pertains to degreased, uncarbonized shorn wool that has not undergone further processing beyond its degreased state. Specifically, it encompasses "other wool" that falls within a defined fineness range: it is finer than 40s but not finer than 44s. The "s" count refers to the number of hanks of yarn, each 560 yards long, that can be spun from one pound of wool fiber. Therefore, this category captures wool fibers yielding a yarn count within this particular mid-range fineness.

This category is distinguished from its siblings primarily by its precise fineness specification. 5101.21.15.00 covers "unimproved wool; other wool, not finer than 40s," meaning it includes wool that is either coarser than 40s or exactly 40s. Conversely, 5101.21.35.00 covers "other wool, finer than 44s," capturing wool fibers that yield a yarn count exceeding 44s. Thus, 5101.21.30.00 acts as a specific intermediate bracket within the broader classification of degreased, uncarbonized shorn wool.

As this is a leaf node in the HTS structure, there are no further subcategories that subdivide this specific classification. Classification at this level is determined by the physical characteristic of wool fiber fineness, measured in the "s" count system, within the broader parameters of being degreased, uncarbonized, shorn wool. Therefore, precise adherence to the fineness range of finer than 40s but not finer than 44s is the sole determinant for inclusion in this category.