Often when we think of silk, we imagine a lustrous, smooth fabric used for clothing and sheets. In fact, there are dozens of different types of silk exist — mulberry, habotai, spider — and many different methods of processing it. Plus, there are several countries that produce silk, including China, India, and Thailand. Silk from one region will have unique properties from silk in a different region.  When it comes to China — where silk was born — “raw silk floss” is used to fill duvets and comforters. It means the silk is left in its raw, natural state to be hand stretched, rather than being uncoiled, spun, and woven into traditional fabrics. The raw silk is fluffy, soft, and lightweight as opposed to shiny and slippery.