All sorts of materials can become knitting yarn as long as they have the right size and length to be knitted by hand, loom or machine; here we should mention cotton, wool, ribbon, string and all sorts of artificial fibers. The aspect to remember before selecting the knitting yarn is that this element gives the actual properties of an item as such. How formal do you want the garments to be? On what weather are you going to wear them? And how often do you need to wash them? This means that the right knitting yarn triggers the success or failure level in a knitting project, although it does not work alone in that direction.