There are two basic ways of felt making: Wet and Dry.
Wet Felting is the process of using water, soap and some form of agitation to cause the fibers to open up and then bind together. You can do this with raw wool fiber, washed fiber, carded batts, or processed wool roving and sliver.
This process also works for felting previously knitted, crocheted or woven items such as wool sweaters.
Have you ever accidentally shrunk a wool sweater by sticking it in the washer and dryer? That’s a form of wet felting! And, you can actually do that on purpose.
What is Dry Felting or Needle Felting? This involves using special barbed needles to basically weave the individual fibers together until they form a matted piece of fabric.
You can do this by hand with a single needle, or with a tool using multiple needles. There are also very large machines which create felt using hundreds or even thousands of needles.
Wikipedia defines Felt as “a textile material that is produced by matting, condensing and pressing fibers together.
Felt can be made of natural fibers such as wool or animal fur, or from synthetic fibers such as petroleum-based acrylic or acrylonitrile or wood pulp-based rayon. Blended fibers are also common”