Headings 6001–6004 cover specific knit fabric types such as pile fabrics, terry fabrics, and weft-knit fabrics. Heading 6005 is the residual category for warp knit fabrics (including galloon-machine fabrics) that do not fall within those earlier headings. The key classification question is the knitting direction and construction method: warp knitting interlocks loops along the fabric length, distinguishing it from weft-knit structures covered elsewhere.

Subheading Note 1 specifies particular fiber-content or construction criteria that must be met for a fabric to be classified at 600535 rather than the other synthetic-fiber subheadings (600536–600539). Importers should review the relevant chapter and subheading notes carefully, and consult a licensed customs broker when the fiber blend or construction is borderline.