What will be the rule to balance whether your luxury silk bedding deserve the high quality? Here are the three most important things to look for in a high quality silk king that will last a long time: 100 percent mulberry silk, also called cultivated silk or bombyx silk A momme count (pronounced "mummy" and indicated by the symbol "mm") of no less than 12. Momme is a standard weight measurement for silk fabric and indicates the heft or weight of the fabric. The higher the momme number the heaver the fabric and the more silk that was used in the production of that piece of fabric. Thread count of 400 or higher although this is not nearly as important of a consideration as the type of silk used and the momme count.