Here is a photo of two types of wool strands. The top one is felting wool and the lower one is stuffing wool. The difference is that the felting wool is much finer and more silky. The lower one is courser and has more space between the fibres. If you stuff dolls with finer, felting type wool, you will end up with more of a lumpy look, you will use a lot more, and it will be much harder work. Also, it is vital that the wool used for stuffing is completely dry of any Lanolin. Even a small amount of "grease" will eventually seep through the doll's tricot skin and create a "greasy" look!