What is it? I don't know.
Here's what I can tell you:
It's a one-of-a-kind fingering weight yarn that seems to be either 100% superwash merino, or a blend of superwash merino and something soft (cashmere? camel? alpaca?). It's very soft and quite smooth, and not too fluffy (I don't think it's a shedder).
Worth taking a chance on!