High Quality Content by WIKIPEDIA articles! Woolen or woollen (American English: woolen; British English and Canadian English: woollen) is a type of yarn made from carded wool. Woolen yarn is soft, light, stretchy, and full of air. It is thus a good insulator, and makes a good knitting yarn. Woolen yarn is in contrast to worsted yarn, in which the fibres are combed to lie parallel rather than carded, producing a hard, strong yarn.