SWTC INC, are pioneers in Earth Friendly fiber and yarn for the hand knitting industry. SWTC INC was the first to bring you amazing fiber from annually renewable resources like corn, soy, milk, and bamboo. In 2006, they introduced Chitin fiber from Shrimp and crab shells in the TOFUtsies sock yarn. And now offer a new yarn, Therapi, made from Jadeite.