Blended or twisted yarns are yarns composed of two or more fibers, such as polyester / cotton blended yarn, wool / polyester blended yarn, wool / nitrile blended yarn, polyester / viscose / nitrile blended yarn, Silk / cotton twisted yarn, etc. There are two or more staple fibers spun into a short fiber yarn called a blended yarn; and a combination of two or more filament yarns (such as twisting) is called a mixed fiber yarn.