Woven Fabrics of Carded Wool or Fine Animal Hair, Mixed with Manmade Filaments

The phrase 'mixed mainly or solely' means the manmade filament component must be the predominant non-wool fiber or the sole other fiber present. A fabric with a small incidental synthetic content that does not constitute the main blending fiber would not qualify under this heading and should instead be classified under the residual 'other' heading. Fiber composition certificates from the mill are essential to support the classification.

The distinction turns on whether the synthetic component is a filament yarn (continuous fiber, heading 511120) or a staple fiber (cut-length fiber, heading 511130). Polyester filament and polyester staple are both common blend partners for wool, but they are classified separately. The yarn construction used in weaving — not the generic fiber type — determines which heading applies.