6404.19.77 - With uppers of textile material other than vegetable fibers and having outer soles with textile materials having the greatest surface area in contact with the ground, but not taken into account under the terms of additional U.S. note 5 to this chapter

This HTS category encompasses footwear with outer soles of rubber or plastics, where the upper is constructed from textile materials other than vegetable fibers. Crucially, the classification hinges on the outer sole's textile component having the greatest surface area in contact with the ground, provided this textile sole is not accounted for under additional U.S. note 5 for this chapter. This definition targets a specific construction and material combination for footwear.

Distinguishing this category from its sibling, 6404.19.72, is the primary characteristic of the upper material. While both consider outer soles with a predominant textile surface area, this category specifically excludes footwear with uppers made from vegetable fibers. Therefore, if the upper is composed of synthetic fabrics, cotton, wool, or other non-vegetable textile materials, it would fall here, assuming all other criteria are met.

Within this classification, a further subdivision exists to account for specific types of footwear. The subcategory 6404.19.77.15 is designated for "House slippers," recognizing their distinct purpose and often simpler construction. The remaining items within this broad category are then captured under a more general "Other" subdivision, catering to the diverse range of footwear that meets the primary criteria but does not fit the specific "house slipper" designation.