Crochet Thread is a light weight, thin yarn used for knitting or crochet. Usually made from 100% mercerized cotton, crochet threads then to have vibrant colors. The best uses for crochet thread is for doilies, coasters, earrings, bracelets, bookmarks, antiques and ornaments. Get our best-selling, high-quality Monaco or Lizbeth crochet threads. Both are 100% mercerized cotton – at our everyday low prices.