5509.22.00.90 - Other (604)

This HTS classification, 5509.22.00.90, covers multiple (folded) or cabled yarn composed of synthetic staple fibers, where the yarn contains 85 percent or more by weight of polyester staple fibers. This category specifically applies to such yarns that do not meet the criteria for classification under sibling categories, particularly those with a final "Z" twist. The "Other (604)" designation indicates that these yarns are not specifically enumerated elsewhere within the multiple (folded) or cabled yarn of polyester staple fiber subheadings.

The key differentiator for this category lies in its exclusion of yarns with a specific "Z" twist, as defined in the sibling category 5509.22.00.10. If a multiple or cabled yarn of polyester staple fiber has a final twist that is not exclusively "Z", or if it is not clearly defined as such, it would fall under this "Other" designation. This highlights the importance of precisely determining the direction and nature of the final twist in the yarn for accurate classification.

As this is a leaf node, there are no further subcategories to introduce. Therefore, the classification hinges entirely on the precise composition and structural characteristics of the yarn, specifically its polyester staple fiber content, its construction as multiple or cabled, and the absence of a definitive "Z" final twist. This implies that any multiple or cabled polyester staple fiber yarn meeting the 85% threshold and not falling into the more specific "Z" twist category will be classified here.