Blended yarn has been used in sportswear for several years. The soft fabric blends made from bamboo yarns are elastic, durable, and easy to dye. Jeans are made with cotton blends, and so are men's, women's, and children's slacks. Blended yarn is commonly used in the production of sweaters, socks, and blankets.
http://www.seagorcare.com/blended-yarn/