Yarns > Cestari Cestari Sheep and Wool Company is a small family-owned and operated American manufacturer of knitting and crocheting yarn. Their farm is located in Augusta County, Virginia where they raise sheep for wool that we use in our yarn. Cestari also sources wool from reputable ranchers throughout the United States. All of their sheep and wool products are always grown and processed in the United States. Cestari cotton products are grown and processed exclusively in Virginia.