Lightweight poly-cotton woven fabrics — where polyester staple fiber is below the 85% threshold, cotton is the dominant secondary fiber, and the fabric weighs no more than 170 g/m² — occupy this precisely bounded classification. The 170 g/m² ceiling is the key specification separating this heading from heavier poly-cotton constructions, and it aligns with the weight range typical of shirting, dress fabric, and lightweight workwear. Importers should note that both the blend ratio and the fabric weight must be confirmed by testing, as either parameter crossing its threshold shifts the classification. Section 301 tariff exposure is a practical concern for poly-cotton fabrics sourced from major Asian producing countries.

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