6203.41.30 - Trousers of worsted wool fabric, made of wool yarn having an average fiber diameter of 18.5 microns or less

This classification pertains to trousers specifically made from worsted wool fabric, where the wool yarn exhibits an average fiber diameter of 18.5 microns or less. This stringent material requirement differentiates these trousers from other woolen or fine animal hair trousers that do not meet this specific fiber diameter threshold or are made from different types of wool fabric. The "Other" designation at this level signifies that these trousers are not specifically categorized by other detailed subheadings within the broader "Trousers, bib and brace overalls, breeches and shorts" category at this stage.

This category serves as a specific grouping for high-quality worsted wool trousers, distinct from the "Other" category at the same hierarchical level (6203.41.60). The latter would encompass any other trousers of wool or fine animal hair not meeting the precise criteria of worsted wool with an average fiber diameter of 18.5 microns or less.

Further refinement within this classification is achieved through its subcategories, which distinguish between trousers intended for men and those for boys. The subdivisions 6203.41.30.10 (Men's) and 6203.41.30.20 (Boys') allow for precise statistical tracking and duty application based on the intended wearer, reflecting a common practice in apparel classification that considers age and gender.