After World War II synthetic fur, a deep-pile fabric closely resembling fur, became popular. George W. Borg was among the first to adapt circular knitting machines to make a pile fabric from synthetic fibers. The machines knit a double layer of fabric leaving free ends of yarn that form a pile as deep as 4 in. (10.2 cm). In 1953 an improved form resembling sheared beaver or mouton was introduced. Later types use different synthetics and are woven as well as knit; they also use cotton backing. Other synthetic furs imitate Persian lamb, seal, ermine, chinchilla, and mink. Since the 1960s synthetic furs have become increasingly popular as a result of their relatively low cost and realistic appearance, greater public awareness of endangered species, and the disappearance of certain furs from the market because of restrictive conservation laws.
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