<P> Silk is resistant to most mineral acids, except for sulfuric acid, which dissolves it . It is yellowed by perspiration . Chlorine bleach will also destroy silk fabrics . </P> <P> RSF is produced by chemically dissolving silkworm cocoons, leaving their molecular structure intact . The silk fibers dissolve into tiny thread - like structures known as microfibrils . The resulting solution is extruded through a small opening, causing the microfibrils to reassemble into a single fiber . The resulting material is reportedly twice as stiff as silk . </P> <P> Silk's absorbency makes it comfortable to wear in warm weather and while active . Its low conductivity keeps warm air close to the skin during cold weather . It is often used for clothing such as shirts, ties, blouses, formal dresses, high fashion clothes, lining, lingerie, pajamas, robes, dress suits, sun dresses and Eastern folk costumes . For practical use, silk is excellent as clothing that protects from many biting insects that would ordinarily pierce clothing, such as mosquitoes and horseflies . </P> <P> Fabrics that are often made from silk include charmeuse, habutai, chiffon, taffeta, crepe de chine, dupioni, noil, tussah, and shantung, among others . </P>

What are the important characteristics of silk that makes it a comfortable clothes to wear
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