From the Indigo Moon Yarns website:

“I know that IMY already has a worsted weight superwash Merino wool but this one is ooooh! so soft and squishy - and is a bit thicker than the regular worsted. Stitches won’t be so overly defined with this yarn. This yarn is not found at retail stores and is in limited quantities and colourways. Check it out at Knit City in October (2013) and feel the softness!