The reason for this will be the next post.
Step 3: Wrap the yarn continously around the cardboard. The more you wrap, the fuller the pom pom will be.
Step 4: Slide the wrapped yarn off of cardboard and tie and knot tightly a piece of yarn around the middle.
Step 5: Cut the circled yarn so that it will be straight and stick out. Trim to desired length or just to tidy it up to all the same length. Enjoy your yarn pom pom!