6107.19 - Of other textile materials:

This HTS category, 6107.19, encompasses men's or boys' underpants and briefs that are knitted or crocheted and are made from textile materials other than cotton or man-made fibers. Unlike the sibling categories 6107.11 (of cotton) and 6107.12 (of man-made fibers), this classification specifically addresses garments composed of different materials, providing a distinct classification path for imports and exports based on fiber content.

The distinction from its siblings is crucial for accurate tariff application. While 6107.11 is for cotton undergarments and 6107.12 is for those made from synthetic or regenerated fibers, 6107.19 acts as a catch-all for underpants and briefs fashioned from a variety of other textile materials. This ensures that items made from less common fibers, such as silk, wool, linen, or blends not primarily composed of cotton or man-made fibers, are correctly categorized.

Within this "other textile materials" grouping, further subdivisions exist to refine classification based on specific fiber content. The subcategories are 6107.19.10.00, which applies to items containing 70 percent or more by weight of silk or silk waste, and 6107.19.90.00, which covers all remaining underpants and briefs under this heading not meeting the silk criteria. These detailed subcategories allow for precise tariff treatment based on the predominant or specified material composition.