6006.33.00.40 - Of polyester (222)

This HTS classification covers knitted or crocheted fabrics made from polyester yarns, specifically those where the yarns are of different colors. The "double knit or interlock construction" specifies the fabric's structure, meaning it's created with two sets of needles working in unison to produce a fabric with a similar appearance on both sides, and is characterized by its stability and lack of curling. These fabrics are typically thicker and more substantial than single knit constructions.

Distinguishing this category from its siblings, 6006.33.00.20 specifically covers knitted or crocheted fabrics of nylon with the same construction and yarn color characteristics. The sibling category 6006.33.00.60, "Other," would encompass fabrics meeting the criteria of synthetic fibers with yarns of different colors and double knit or interlock construction, but made from materials other than polyester or nylon.

As this is a leaf node, there are no further subcategories for this specific HTS code. Therefore, the classification hinges on confirming the material (polyester), yarn coloration (different colors), and construction (double knit or interlock). Examples within this category could include certain types of performance wear fabrics, upholstery materials, or specialized apparel linings where a stable, reversible knit from multi-colored polyester yarns is required.