Flamme Yarns are a kind of novelty yarn. It is generally a loose or
untwisted core wrapped by at least one other strand. The extra element
can be a metallic thread, or a much-thicker or much-narrower strand of
yarn, or yarn that varies between thick and thin. Some companies have
come to put twin yarns on the market to show off combinations of one
regular yarn and novelty yarns in assorted colors or even two different
types of novelty yarns.