Synthetic dreads are made of artificial fibers such as henlon (also known as monofiber), kanekalon, and other plastics. They come in a great variety of textures and often look more realistic. Yarn dreads are softer and more comfortable than most synthetic dreads because they are made of wool (natural fibers) and acrylic (synthetic fibers that more closely mimic wool). Wool yarns specifically have more variety in color because they can be dyed.