I was able to start a bit of the ribbing last night while I watched In America (not nearly as depressing as people were saying). The pattern calls for size 10 and 10.5 needles. I started swatching on the 10.5s and was slightly over gauge. Surprisingly, the 10s were spot on. At first glance, this yarn looked much thinner than Goa, but it knits up just about the same.