6203.43.45.00 - Containing 15 percent or more by weight of down and waterfowl plumage and of which down comprises 35 percent or more by weight; containing 10 percent or more by weight of down

This HTS category, 6203.43.45.00, specifically classifies men's or boys' trousers, bib and brace overalls, breeches, and shorts crafted from synthetic fibers. The key defining characteristic of goods within this subcategory is their significant down and waterfowl plumage content. Specifically, the garments must contain 15 percent or more by weight of down and waterfowl plumage, with down constituting at least 35 percent by weight of that mixture. Furthermore, a broader condition for inclusion is the presence of 10 percent or more by weight of down, regardless of the waterfowl plumage proportion.

Distinguishing this category from its sibling, which is also "Other" within the "Of synthetic fibers" grouping for trousers, bib and brace overalls, breeches and shorts, hinges on the unique composition requirements related to down and waterfowl plumage. While the sibling category would capture synthetic trousers without these specific filling criteria, 6203.43.45.00 is reserved for those items where down and feathers form a substantial component, often indicative of outerwear designed for significant insulation. The classification is driven by the precise percentage thresholds of these particular fillings, overriding general textile composition for insulation purposes.

As this is a leaf node within the HTS, there are no further subcategories. Therefore, classification within this code is final based on the defined material composition and the overarching classification of men's or boys' trousers, bib and brace overalls, breeches, and shorts of synthetic fibers. Importers and exporters should meticulously verify the weight percentages of down and waterfowl plumage to ensure correct entry and compliance.