There are many different types of jumbo yarns for sale including popular yarns from Loopy Mango. This is often made from merino wool and comes in large thick strands of soft fibers. It has many names including giant wool yarn, chunky arm knitting yarn, and wool roving. Jumbo yarn can be substituted by knitting with two strands of super bulky yarn together. A chunky knit blanket knit with jumbo yarn is seen in the image below.