Unfinished felt — neither impregnated with resins or chemicals, nor coated, covered, or laminated — in this heading encompasses both woven-and-fulled and needleloom constructions not covered by the needleloom-specific heading, serving craft, apparel, millinery, and light industrial uses. The absence of any surface treatment or lamination is the key classification boundary; felt that has been treated with a binder, coating, or backing layer moves to the impregnated/coated heading. Wool felt and synthetic fiber felt (polyester, acrylic) are the dominant commercial varieties, with wool felt commanding premium pricing for hat-making and acoustic applications. Fiber content and basis weight are the primary trade specifications.

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