5109.90.90.00 - Other (400)

This HTS category, 5109.90.90.00, covers "Other" yarns of wool or fine animal hair, put up for retail sale, that do not fit into more specific subcategories within heading 5109. This includes yarns that may be blends not primarily composed of wool or fine animal hair, or have characteristics not otherwise detailed. The "Other" designation signifies that these yarns fall outside the primary classifications based on material composition or specific processing.

Within the "Yarn of wool or of fine animal hair, put up for retail sale" section, this category serves as a residual classification. It is distinguished from its sibling category, 5109.90.80.00, which specifically enumerates yarns of wool fiber with an average fiber diameter of 18.5 microns or less. Therefore, 5109.90.90.00 would encompass yarns of wool or fine animal hair that either do not meet this specific micron diameter criterion or are composed of materials that result in their exclusion from the more narrowly defined categories.

As this is a leaf node, there are no further subcategories. Classification within this code hinges on the careful examination of the yarn's material composition and its intended presentation for retail sale, ensuring it does not meet the criteria for any other more specific HTS classification under heading 5109.