It uses a combination of two yarns. For mine I used Noro Kureyon for the variegated yarn and Rowan Cocoon for the plain yarn.
The cardigan is knitted throughout with knit and slip stitches which gives it is unique look. to achieve the correct tension I had to go up to 8mm needles using 1 strand of each wool. The body of the jumper is knitted in one piece up to the armhole shaping so my trusty Knitpro IC and one of my longest wires came into use.
Not 100% happy about the buttons but will sleep on it.
Knitted in the round on 4 needles (Knitpro) with stripes and intarsia.
Knitted in Noro Silk Garden sock wool and Rowan Pure Wool 4ply, the pattern was for 2 shades of Noro but I think they have come out OK using a plain and a variegated wool. The pattern is also a Noro Pattern from the Noro Knits book.