The yarn is Trensetter Tonalita (blue/grayish blue/chartreuse) and Trensetter Merino VII (cobalt)held together (the class is given by a Trendsetter rep). I've never used 2 yarns at the same time before. It's easy and it made the sweater go quickly since it's on size 11s instead of, say, 7s. It sure does eat up yarn though. Every time I turn around I'm grabbing another ball.
The tonalita, which I'd never seen, comes in lots of colors and is similar to Noro Kureyon. It is softer than Noro. The Merino is very sproingy but I didn't like how monotone it looked alone.
More than I ever thought I would spend on yarn for one garment, so I'm dying to have it look good enough to wear.