From the North American Schachenmayr website:
Choose four exciting colors from the Schachenmayr original Boston colors and work in rounds of double crochet for a fast, creative and easy hat to make and wear!

This is a FREE pattern available to all visitors of the North American Schachenmayr website.

Finished dimensions:
Head circumference: 22 inches (56 cm)
Height of hat: 8¼ inches (21 cm)

Yarn Information:
A - #00171 neon green
1 skein
60 yards

B - #00136 neon pink
1 skein
60 yards

C - #00121 neon yellow
1 skein
60 yards

D - #00122 neon orange
1 skein
60 yards