This protective function performs best clothing made of natural fibers. It must be acknowledged (by highlighting a few exceptions), which is currently difficult to find a substitute for wool or silk. Wool clothing people use 7000 years.
Even the ancient Egyptians warmed, throwing wool felt. Currently, clothing made of pure natural wool is the best, but it is quite expensive. Silk clothes began to use only 5000 years ago. In ancient China, it was the greatest state secret: for export silkworms, the larvae of the testicles or abroad is punishable by death, but Roman merchants broke the ban and through Byzantium brought silkworms in Europe.
Silk is in no way inferior wool. It has many advantages, but more expensive than wool. Cotton began to use 7000 years ago, as a completely natural product, also inexpensive. However, he has some drawbacks, such as winter clothes of cotton is not warm.
