The US tariff schedule uses a 70% silk content threshold to split silk-containing garments into two separate 10-digit lines — 6107295000 for articles at or above 70% silk and 6107299000 for those below. Each line carries its own duty rate, so accurate fiber-content testing and documentation are essential before entry.

Classification depends on which fiber predominates by weight under the essential character rules. If wool or fine animal hair is the chief weight component, 6107292000 applies; if silk predominates and meets the 70% threshold, 6107295000 would govern. A binding ruling from CBP is advisable for borderline blends.