A bolduc is a narrow strip assembled from parallel warp yarns held together by adhesive rather than interlaced with a weft. Because it lacks a true woven structure, it would not qualify as a woven fabric under the general rules, so heading 5806 explicitly includes it. Bolducs are used primarily as tie-on labels and packaging tapes.

Subheading 580620 covers narrow woven fabrics containing 5% or more by weight of elastomeric yarn or rubber thread. If the band meets that threshold — whether the elastic component is rubber thread, spandex/elastane, or another elastomeric yarn — it falls under 580620 rather than the fiber-specific subheadings. The 5% threshold is measured by weight of the total fabric.