6002.40 - Containing by weight 5 percent or more of elastomeric yarn but not containing rubber thread:

This HTS category, 6002.40, encompasses knitted or crocheted fabrics specifically characterized by the inclusion of five percent or more by weight of elastomeric yarn. Crucially, these fabrics must *not* contain rubber thread. This distinction is key to their classification, differentiating them from other categories that may include rubber thread. The scope of this heading is limited to fabrics with a width not exceeding 30 centimeters and excludes those classified under heading 6001.

Within the broader context of knitted or crocheted fabrics, this specific heading focuses on those with enhanced elasticity due to elastomeric yarn content, while deliberately excluding the presence of rubber thread. This precise composition allows for garments and other textile articles that benefit from stretch and recovery properties, but are not defined by the use of rubber.

The subcategories within 6002.40 further refine the classification based on the predominant fiber content. "6002.40.40.00" specifically identifies fabrics of cotton that meet the elastomeric yarn criteria. "6002.40.80" then serves as a residual category for all other fabrics within this heading that are not primarily of cotton, allowing for the accurate classification of a diverse range of materials that utilize elastomeric yarn for enhanced performance.