6403.59.30.20 - With pigskin uppers

This HTS classification, 6403.59.30.20, specifically covers footwear for men where the outer sole is made of leather, and the upper is constructed from pigskin. The "welt footwear" designation indicates a particular construction method where the upper is stitched to a welt, which is then attached to the sole and insole. This meticulous construction is a key characteristic that distinguishes these shoes.

Unlike its sibling category, 6403.59.30.40, which covers "Other" types of men's footwear with leather outer soles and leather uppers that do not fall under the welt construction or specific upper materials, this sub-heading is narrowly defined by the use of pigskin for the upper. The emphasis on pigskin as the primary material for the upper differentiates it from other leather types that might be covered under a broader classification.

As a leaf node, this classification represents the most granular level for this specific type of footwear. Therefore, there are no further subcategories. The classification criteria are solely focused on the combination of men's sizing, leather outer sole, welt construction, and the explicit presence of pigskin for the upper material. Any deviation in these characteristics would necessitate re-evaluation under a different HTS code.