6403.99.40.91 - Other

This classification, HTS 6403.99.40.91, covers "Other" footwear where the outer sole is constructed from rubber, plastics, leather, or composition leather, and the upper is made from leather. Specifically, this "Other" designation at the most granular level indicates footwear that does not fit into more precisely defined subcategories within the broader "Welt footwear" or "Other" categories at preceding levels. These are generally specialized or less common types of leather-upper footwear that do not conform to typical construction methods or design parameters that would place them in other headings.

The distinction from its sibling category, 6403.99.40.80 ("For women"), is based on the intended wearer. While both share the same material and construction characteristics of leather uppers and specified outer soles, this specific code applies to footwear not explicitly designed for women. This implies coverage for footwear intended for men, children, or potentially unisex designs where the primary classification factor is not gender-specific design.

As this is a leaf node in the HTS structure, there are no further subcategories to introduce. Classification under HTS 6403.99.40.91 therefore hinges on fulfilling the material and construction requirements of Chapter 64, falling under the "Other footwear" and "Other" subdivisions, and not being specifically designated for women, nor fitting into any more specific prior classifications within the footwear of leather category. Practical application would involve careful examination of the footwear's construction and intended purpose to ensure it doesn't qualify for a more specific HTS code.