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If a yarn is described as "wool", that means it is made from the shearings of sheep. Wool yarns come in all different thicknesses and textures, from soft to more course. Many crocheters like to work with wool yarn because it can have some spring and give to it, making it very versatile when working different kinds of stitches and patterns. Pure wool is used for crocheted pieces that are going to be "felted" (see our tip on felting), but wool blends often can be handwashed or even machine washed. Wool is a great natural fiber for crochet projects and is abundantly available and reasonably priced.