5509.53.00 - Mixed mainly or solely with cotton

This HTS category, 5509.53.00, encompasses yarns spun from polyester staple fibers that are mixed predominantly or exclusively with cotton. These yarns are not intended for retail sale and fall under the broader classification of man-made staple fibers. The key defining characteristic is the presence of polyester staple fibers blended with cotton.

This specific classification distinguishes itself from its siblings by its material composition. Unlike 5509.51, which mixes polyester staple fibers with artificial staple fibers, or 5509.52.00.00, which blends with wool or fine animal hair, this category is solely for blends with cotton. 5509.59.00.00 serves as a residual category for other mixtures not covered by the preceding subheadings.

The yarns within this category are further subdivided based on their fineness, measured in tex (nm). Subcategory 5509.53.00.30 covers yarns with a fineness not exceeding 52 nm, while 5509.53.00.60 includes yarns that exceed 52 nm. This distinction is important for tariff purposes, as finer yarns may have different tariff implications.