6403.99.90.21 - With pigskin uppers

This HTS classification, 6403.99.90.21, specifically covers footwear designed for women that have outer soles of rubber, plastics, leather, or composition leather, and uppers made from pigskin. These are considered "other" footwear within the broader category of leather footwear, falling under miscellaneous types not specifically defined elsewhere. This means they do not fit into the more defined categories of tennis shoes, basketball shoes, or similar athletic footwear for women, nor are they explicitly classified as other types of women's footwear under preceding subheadings.

The key distinguishing feature of this classification is the material of the upper: pigskin. This differentiates it from other "other" women's footwear that may have uppers of different leather types or other materials. Since this is a leaf node in the HTS structure, there are no further subdivisions under this specific code. Therefore, the classification hinges entirely on the combination of the women's footwear designation, the specified outer sole materials, and the exclusive use of pigskin for the uppers, with a value exceeding $2.50 per pair.