A springy work-horse sock yarn. Sisu is a 4-ply wool/nylon blend that creates long-wearing socks free of pilling, felting or shrinkage. Sisu is available in a wide range of colours in 50g balls, which means more flexibility when knitting a wide range of sock sizes, or when you would like to alternate heel and toe colour. Sisu is soft enough to use for accessories such as cowls and mittens, too!