It is knitted with Knit Picks Bare Superwash, which is a lovely stretchy, soft yarn, and made the cables easy to execute.
The pattern itself is difficult to read, so if for some crazy reasonn you decide to knit this sweater, I can forward you abbreviated cable directions as I translated them. (Assuming we can somehow prove you already bought the pattern, so we don't violate copyrights.)
The yarn pilled a bit and got fuzzy when I washed and machine dried it, so I would recommend laying flat to dry. I think the plies are pretty lightly spun to keep it soft, but this sacrifices durability.