Polythylene terephthalate fibers dominate the automotive fabrics market with a market share of approximately 83 percent. Nylon fiber has lightfastness and temperature resistance properties that restrict its use in automobile seat upholstery. The humidity absorption and humidity transfer properties of polyester fiber are only narrowly sufficient for automobile upholstery. The lightfastness of wool fibers is insufficient for automobiel seat fabrics. Although yarns with dull optics and low titanium dioxide content are optimal for this end use, titanium dioxide yarns present challenges in terms of ultraviolet light resistance. Automotive upholstery fabric manufacturers must balance thee parameters through careful selection of fiber type, fiber blend, yarn properties, and fabric construction. 2 refs.