Untreated raw silk. Without chemical treatment. Silk is also a protein fiber just like wool. It is wrinkle-resistant, dimensionally stable and moisture-absorbent. Silk regulates the body temperature, is cooling in hot weather and warming in cold weather. It has a low density, is thus easily and conveniently. At the same time it is the strongest natural fiber. Due to the high content of silk glue this quality natural material has anti-inflammatory effects.