0505.10.00.55 - Down

This HTS category, 0505.10.00.55, specifically classifies "Down" that meets the testing regulations outlined in ASTM D4522, Section 2.2, IDFB Testing Regulations Part 2, Sections 2.2, 2.3, Part 7, and Part 11-B. Down, in this context, refers to the soft, fluffy undercoating of birds, distinct from their outer feathers. It is characterized by its fine structure and excellent insulating properties.

This classification differentiates "Down" from its sibling category, "Feathers" (0505.10.00.50). While both are derived from birds, "Down" is the fine, filament-like material found beneath the contour feathers, whereas "Feathers" are the more structured outer plumage. The stringent testing requirements specified here are crucial for verifying the quality, purity, and performance characteristics of the down for specific end-uses, often related to bedding, apparel, and other textile products requiring superior insulation.

As this is a leaf node in the HTS classification system, there are no further subcategories under 0505.10.00.55. Therefore, all down meeting the specified ASTM and IDFB testing criteria, not further processed than cleaning and preservation, will be classified here. This ensures that down of a particular quality and provenance, validated through these recognized standards, is correctly identified for customs purposes.