From the Knit Rowan website:
Knit this children’s accessory tam from ONCE UPON A TIME, designed by Marie Wallin using Rowan Felted Tweed, this little pull on hat has a contrasting fairisle snowflake motif.

Finished dimensions:
Circumference
48, 56 cm
19, 22 inches

Length
19, 21 cm
7½, 8½ inches

Yarn information:
A - Clay 177
1, 1 skein
191, 191 yards

B - Peony 183
1, 1 skein
191, 191 yards