Ann Arbor has yarn and knitting supplies available for sale. Knitting refers to interweaving of yarn to make a piece of clothing or fabric. A number of different supplies are needed for this activity, such as needles, cables, yarns of many different colors (the yarn is made from wool, usually. They can also be obtained from the fur of other animals), designs and patterns and books. Classes may also be held for enthusiasts by the outlets in Ann Arbor. They provide a one-stop shop for all your knitting needs. Knitting for charity or for war veterans may also be organized by these shops, which are usually independent in nature.