From the Knit Rowan website:
This cute, slouchy beanie 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 52 cm, (20½ inches) around head.

Yarn information:
Plain Beanie photographed with Rowan Creative Focus Worsted in Cobalt 01107
1 skein
220 yards

Striped Beanie photographed with Rowan Creative Focus Worsted
A - Carmine 02055
1 skein
220 yards

B - Blue Smoke 03089
1 skein
220 yards

Yarn substitution note:
If you choose you could also knit this project in Rowan Pure Wool Superwash Worsted. Please note that this yarn has a slightly different row tension as standard so please check your tension carefully and adjust needles accordingly.

Our suggested Pure Wool Superwash Worsted yarn shades are:
Striped version with (A) Cardinal 136, (B) Light Denim 154.
Plain version with Light Navy 153.