as long as you make it out of 100% nontreated natural animal fiber.
it's usually suggested you use a needle 2-3 sizes bigger than the largest listed on the yarn label, and usually it ends up 2/3 of the size you start with, depending on how long you let it agitate.
I want to see if you do!
felting was my favorite thing when I didn't want anyone to see my stitches. :oops: now I'm going to try it soon just to make something nice, I hope.