From the Designer:

This hat will help you practice the seed stitch as well as changing yarn colors mid-project. It is meant to match the Seed Stitch scarf found on pages 62-63, so use any leftover yarn from this project for the scarf.

Materials
Needles, circular (size 7, 16” long)
Scissors
Yarn, worsted (200 yds per color) in 3 colors