5810.99 - Of other textile materials:

This HTS category, 5810.99, encompasses embroidery produced on textile materials that are neither cotton nor man-made fibers, and are not specifically enumerated in other subcategories of Chapter 58. This includes, but is not limited to, embroidery applied to fabrics made from natural fibers such as wool, silk, linen, or other fine animal hair, as well as composite textiles where the primary material falls outside the scope of cotton or man-made fibers. The embroidery can be presented in the piece, as strips, or as individual motifs.

Crucially, this category is distinguished from its siblings by the material composition of the underlying fabric. For instance, 5810.91 specifically covers cotton embroidery, while 5810.92 pertains to embroidery on man-made fiber textiles. Therefore, if the base textile material is not cotton or a man-made fiber, it generally falls into the "of other textile materials" designation.

The subcategories under 5810.99 further refine the classification based on the specific type of "other" textile material. 5810.99.10.00 addresses embroidery specifically on wool or fine animal hair textiles. Any remaining embroidery that does not fit the wool or fine animal hair criteria, but still comprises "other textile materials" not covered by the primary siblings, will be classified under the residual category 5810.99.90.00.