From the Knit Rowan website:
Knit these accessory bow slippers, with cosy lining, available as a free pattern to download. Designed by Jem Weston using Felted Tweed DK and Creative Focus Worsted (wool and alpaca), a beautiful blend of merino wool, alpaca and viscose for the uppers and bows and Fur (wool), a lightweight textured yarn for the lining. This pattern is suitable for the intermediate knitter.

Yarn information:
Rowan Fur
A - Polar 090
1 skein
66 yards

Rowan Felted Tweed DK
B - Rage 150
1 skein
191 yards

Rowan Creative Focus Worsted
C - Natural 100
1 skein
220 yards