From the North American Schachenmayr website:
Three color crochet hat in Schachenmayr original Schachenmayr original Boston -- fast and easy to make - great for yourself or gifts!
(Note: The website incorrectly states Bravo Big as the recommended yarn. The downloaded pattern clearly specifies the Boston yarn.)

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

Finished dimensions:
Head circumference: 20 inches (51 cm)
Height of hat: 8¾ inches (22 cm)

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

B - #00010 chestnut
1 skein
60 yards

C - #0065 teal
1 skein
60 yards