Catherine is 100% Merino. Its spun from 3 plies, 2 Strands of Merino and 1 of Superwash Merino. The slight difference in the two gives the yarn a beautiful marled, slightly tweedy look. It is beautifully woolly and plump and perfect for cosy DK knits. It is available in an array of hand-dyed shades from Solstice Yarns There is also a 4 ply version of this yarn called Firebrand, also available from Solstice Yarns.