Often regarded as the "fabric of Long Johns,†the history of thermal fabric extends far beyond the scope of "long underwear.†Developed in 1792 by British industrialist John Smedley, thermal fabrics, comprised of two-ply wool or wool blend, were designed to trap heat and insulate against cold air. By the 17th Century, some interpretations of thermal fabric included a layer of polyester that was used to transport moisture away from the body. By the 19th Century, after the official introduction of "long johns,†thermal fabrics had made their way to the US, where cotton or cotton-polyester blends with a box-weave or waffle texture became most popular. These days, thermal fabrics are used in the construction of every cold-weather item from sweaters to coats to flannel blankets.
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