From the Knit Rowan website:
This adorable slouchy beanie, with tie detail and pom poms has been designed by Martin Storey using Creative Focus Worsted this pattern can also be knitted in Pure Wool Superwash Worsted (superwash wool.)

Finished dimensions:
Completed beanie measures 54 cm (21½ inches) around head.

Yarn information:
photographed with Creative Focus Worsted in Magenta 01890
1 skein
220 yards