They are open in the middle and covered with a soft fabric, to mimic the feel of a hammock.

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DuPont predicts demand for Sorona, which turns out a soft and stretchy fabric like a cross between nylon and polyester, reaching 1 billion pounds or more by 2010.

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Yet it took six months to find a source for a soft, well-draped fabric that was free of potentially harmful dyes and finishing chemicals.

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