Nap: A fibrous surface given to a cloth when part of the fibers is raised from the basic structure.

Narrow Fabric: Any nonelastic woven fabric, 12 inches or less in width, having a selvage on either side, except ribbon and seam binding.

Natural Fiber: A class name for various genera of fibers (including filaments) of: (1) animal, (2) mineral, (3) vegetable origin. For example: (1) silk and wool, (2) asbestos, and (3) cotton, flax, jute, and ramie.

Novelty Yarn: A yarn produced for a special effect. Novelty yarns are usually uneven in size, varied in color, or modified in appearance by the presence of irregularities deliberately produced during their formation. In singles yarns, the irregularities may be caused by inclusion of knots, loops, curls, slubs, and the like. In plied yarns, the irregularities may be effected by variable delivery of one or more of its components or by twisting together dissimilar singles yarns. Nub and slub yarns are examples of novelty yarns.