This is knit with two strand plotulopi held together.
I am not sure what weight this equates to.
Sweater is knitted in 2-ply unspun Icelandic wool called Plötulopi. Wind two strands of wool softly together from the plates for each color. Body and sleeves are worked in the round from lower edge to underarms, then joined to work yoke in the round. Round begins at left side of body. On yoke, round begins on the left side of back at the joining of body and sleeve.