The most popular yarn on Ravelry. This 100% wool, Double Knit Worsted weight yarn is available in an incredible selection of colours, including a huge number of beautiful heathers. It's great for everything from felting to sweaters! Made in Peru. Cascade 220 is just simply one of our most popular yarns. This 100% wool, worsted weight yarn is available in an incredible selection of colors, including a huge number of beautiful heathers. It's great for everything from felting to sweaters! Made in Peru.