The width threshold is the sole structural dividing line: 6002 covers narrow fabrics not exceeding 30 cm wide, while 6004 covers fabrics exceeding 30 cm wide. Both require 5% or more elastomeric yarn or rubber thread by weight and exclude pile fabrics. A fabric that straddles the 30 cm boundary should be measured carefully, as the width determines which heading applies.

Taiwan has a well-established technical textile manufacturing sector with significant capacity in warp-knitting and circular-knitting of stretch fabrics, particularly for performance apparel and swimwear applications. This specialization in high-elastomeric-content fabrics has made it a leading source for US buyers sourcing wide elastic fabric for cut-and-sew operations.