Nuno felting is a Japanese fabric felting technique that incorporates wool, a fabric such as silk gauze or chiffon. Soap and water plus some muscle that involves rolling the fabric to start the felting process. So how does the project being made stay together? As you are rolling, the fibers weave their way through the fabric and lock in. The process of using hot and cold water shrink the fabric that holds fiber in place creating a light weight felted piece that will not stretch out of shape.