To get perfect satin bed sheets, you need to understand the rules first. Silk sheets are measured by their weight, known as the momme weight, as well as its thread count. The higher the momme weight of the silk cover sheets, the more durable the sheets. Momme weight of 12-19 is considered best, and thread counts should at the minimum of 400. Remember that mulberry silk will be more expensive but that it also will last longer. Wild silk will have a rougher texture, and the material will have slubs or irregularities in it. Everything will deserve the cent, you may believe it.