From the North American Schachenmayr website:
Really cool, man! Whether kiteboarding, sand yachting or playing beach volleyball – with this hat in Schachenmayr original Boston being active is even more fun. And not only by the sea --everywhere this cool accessory will be the envy of all!

Finished lower width dimensions:
Completed hat fits a head circumference of 22 to 24 inches (56 – 60 cm).

Yarn Information:
A - grey heather col. 00092
1 skein
109 yards

B - navy col. 00050
1 skein
109 yards