6109.90.10.13 - Men's (638)

This HTS category, 6109.90.10.13, specifically classifies men's knitted or crocheted tank tops and singlets constructed from man-made fibers, and which are not of cotton or man-made fibers that have been dyed or are printed with motifs or designs not specifically mentioned elsewhere in the tariff. The defining characteristic of this subcategory is its focus on male garments fitting the description of tank tops and singlets, made from synthetic or artificial fibers.

Distinguishing this classification from its sibling, 6109.90.10.25, is the explicit designation of "Men's" in the code. The sibling category covers "Boys'," indicating a clear distinction based on the intended gender and age group of the wearer. Both fall under the broader heading of "tank tops and singlets" and "of man-made fibers," but the final digit differentiates the specific demographic.

As this is a leaf node, there are no further subcategories to introduce. Classification within this HTS code hinges on the garment being a tank top or singlet, knitted or crocheted, made from man-made fibers, and intended for men. Exclusions would include similar garments made from other materials or for different demographics, as well as those with specific dyeing or printing treatments not covered here.