Although the producing process of the silk has spread abroad, China is still the only country who can produce the best silk bed sheets, therefore, many famous and romantic legend comes with the mysterious silk comforters Chinese.
At one point in history, the Chinese authorities were so adamant about protecting their secret about silk that anyone giving the secrets away or smuggling out silkworms or their cocoons was punished by being put to death. That may be why the secret of silk is said to be the most zealously guarded secret in history.
Legend has it that the secret of silk escaped China when a Chinese princess smuggled cocoons out of the country with her when she married a foreign prince by hiding them in her elaborate hairdo.
Another legend says the secret of silk production left China via the walking staffs of two monks who hid silkworms in the hollow shafts of them because of a request to do so by Emperor Justinian.
After all, these are just the stories, which for the nice skill kept by Chinese, and it also indicates that silk is from China, and therefore, best silk duvet king is from China, as well!