6401.99.90.00 - Other

This HTS category, 6401.99.90.00, encompasses waterproof footwear with outer soles and uppers of rubber or plastics, where the uppers are not fixed to the sole by stitching, riveting, nailing, screwing, plugging, or similar assembly processes. This classification serves as a residual category for waterproof footwear that does not meet the specific criteria of other headings within 6401.99. These items are characterized by their construction methods, emphasizing techniques like molding or vulcanization to attach the upper to the sole, rather than traditional fastening methods.

This category is distinguished from its sibling, 6401.99.80.00, which specifically covers footwear where over 90 percent of the upper's external surface area is composed of rubber or plastics. The "Other" designation in 6401.99.90.00 implies that these items, while still waterproof and constructed with rubber or plastic uppers and soles without conventional assembly, do not meet the high percentage threshold for rubber or plastic coverage on the upper as defined in the sibling category. Consequently, this residual category captures a broader range of waterproof footwear meeting the fundamental assembly criteria of 6401.99 but falling outside the more specific material composition of the preceding subheading.

As this is a leaf node, there are no further subdivisions. Classification into this category depends on a careful assessment of the footwear's waterproof nature, the materials of the outer sole and upper, and the absence of the specified assembly methods. If a piece of footwear meets the broad requirements of 6401.99 but does not qualify for any more precisely defined subheadings, it will be classified here.