6105.20.10.00 - Containing 23 percent or more by weight of wool or fine animal hair (438)

This HTS classification, 6105.20.10.00, specifically covers knitted or crocheted shirts for men or boys that are primarily composed of man-made fibers. The defining characteristic for inclusion in this subcategory is that the garment must contain 23 percent or more by weight of wool or fine animal hair, in addition to being constructed from man-made fibers. This distinction is crucial as it differentiates these shirts from those made predominantly of other materials.

Within the broader category of men's or boys' knitted or crocheted shirts of man-made fibers, 6105.20.10.00 stands apart from its sibling category, 6105.20.20, which encompasses "Other" knitted or crocheted shirts of man-made fibers. The "Other" category would typically include shirts made from man-made fibers where the wool or fine animal hair content is less than 23 percent by weight, or if they are made entirely of man-made fibers without a significant wool or fine animal hair component.

As this node is a leaf node, there are no further subcategories to introduce. Therefore, accurate classification under 6105.20.10.00 hinges on confirming both the garment's type (men's or boys' shirt, knitted or crocheted), its primary fiber composition (man-made fibers), and the specific threshold of 23 percent or more by weight of wool or fine animal hair. This precise material composition dictates its distinct placement within the tariff schedule.