6211.12.40.00 - Containing 70 percent or more by weight of silk or silk waste (759)

This HTS category, 6211.12.40.00, specifically classifies women's or girls' swimwear that is predominantly composed of silk or silk waste, accounting for 70 percent or more by weight of the fabric. This designation ensures that garments primarily made from these luxurious natural fibers are correctly identified for customs purposes, differentiating them from swimwear made of other materials.

The key distinguishing factor for this subcategory lies in its material composition. It is distinct from the sibling category 6211.12.10, which covers swimwear made from man-made fibers, and 6211.12.80, which encompasses other swimwear not meeting the specific material criteria of the silk-based category. Therefore, the presence of silk or silk waste as the primary component by weight is the definitive characteristic for classification under 6211.12.40.00.

As a leaf node, this category does not have further subdivisions. Classification within 6211.12.40.00 is therefore directly determined by the item being women's or girls' swimwear and meeting the 70% or more silk or silk waste content requirement by weight. Examples would include bikinis, tankinis, one-piece swimsuits, and swimdresses constructed primarily from silk fabrics.