From Book:
Funky Chunky Crocheted Accessories by Jan Eaton
Making Hat & Earflaps Pg. 6

• Use 1 ball of pure wool chunky yarn with approx 100 yds (92 m) per 100 g ball

• Size I (5.5 mm), size J (6 mm), and size K (6.5 mm) crochet hooks or sizes needed to achieve gauge

• Split ring marker

• Yarn needle