These slippers are felted. The best yarn weight for the slippers is chunky weight, but you can achieve the same effect by holding two strands of double knit together. If you choose to knit these slippers with two strands of double knit, you will have endless possibilities for wonderful colour combinations! Why not try strands of two different colours and see the effect of that when they melt together in the felting process?
Please bear in mind that the instructions in these patterns are written for Uradale Yarns exclusively. If you use other yarns they are likely to behave differently in the felting process.