5309.21.30 - Containing cotton and man-made fibers

This HTS category, 5309.21.30, specifically classifies woven fabrics that contain both cotton and man-made fibers. The key determinant for inclusion here is the presence of both fiber types, with neither dominating to the extent of meeting the criteria for other flax-based fabric categories within the chapter. These fabrics will possess characteristics derived from both cotton's natural properties and the diverse functionalities of man-made fibers.

Within the broader context of woven fabrics of flax, this specific sub-heading distinguishes itself from sibling categories by its precise fiber composition. While other categories might focus solely on flax content or specific processing treatments, 5309.21.30 is reserved for blends where cotton and man-made fibers are significant components, and the fabric is unbleached or bleached.

This classification serves as a gateway to further subdivisions based on specific trade restraints. The subcategories, such as those "Subject to cotton restraints" and "Subject to man-made fiber restraints," and the general "Other" subcategory (5309.21.30.90), allow for more granular categorization based on import quotas or specific trade agreements that may apply to fabrics containing these particular fiber types.