From the Knit Rowan website:
Knit this accessory beret, designed by Heike Kruessel using the stunning yarn All Seasons Chunky (cotton and acrylic), this slouchy pull on hat is a must knit for the season.

Finished dimensions:
Completed Hat measures approximately 25 cm (10 inches) deep and has a circumference of approximately 50 cm (19½ inches).

Yarn Information:
Photographed in Heatwave 608
2 skeins
186 yards

Available at Wayback machine