Multiple or Cabled Combed Cotton Yarn, 85%+ Cotton, Not for Retail, Over 14 NM to 43 NM

Compact ring spinning condenses the fiber bundle immediately before twisting, reducing protruding fibers and producing a smoother, stronger, lower-hairiness yarn compared to conventional ring spinning. Fabrics woven from compact yarn typically show better abrasion resistance and a cleaner surface finish. The US tariff schedule isolates compact ring-spun yarn in the 41–43 NM sub-range under line 5205420021, so importers must confirm with the mill whether compact or conventional ring spinning was used.

The boundary between these headings is 43 NM per single yarn: 520542 covers 'over 14 NM but not over 43 NM,' meaning 43 NM falls within 520542. If the mill certificate shows exactly 43 NM, the shipment classifies here. However, if there is any uncertainty about measurement methodology or rounding, obtaining an independent laboratory test report and consulting a licensed customs broker before filing entry is strongly advisable.