Width is measured as the fabric's actual usable width, excluding any selvedge that is not part of the functional fabric. Fabrics exceeding 30 cm in width fall outside heading 5806 and are classified under the broad fabric headings of Chapter 58 (e.g., 5801 for woven pile fabrics). Importers dealing with fabrics near the threshold should obtain precise width measurements from the mill and document them, as CBP may verify width at examination.

Line 5806102400 specifically covers narrow woven pile fabrics of man-made fibers that function as fastener tapes — the hook-and-loop type used in closures. The pile construction creates the mechanical fastening surface. Other man-made fiber narrow pile fabrics without a fastening function are classified under 5806102800. Correct classification between these two lines depends on whether the fabric is designed and marketed as a fastener component.