Hat is worked sideways.

Rather than calling for an exact gauge and a specific number of stitches, this hat pattern adjusts to your own gauge to make planned
pooling easier to start. The colors of the hat should shift 1 stitch each row. To be successful the most important thing is to have a consistent
gauge throughout the hat. Letting your tension loosen or tighten mid project will cause the pooling pattern to change.

When you begin a new ball change balls where the yarn changes color and match the new ball to the old ball to ensure the pattern doesn’t get disrupted.