You can order it from Joann.com as well. It's just called "Anti-Pill Fleece". That's what the signs and bolt ends say at the store, too.
I've found it to be too thick to wick properly as an inner, though. I use 2 layers of it for covers. My Joann's still carries microfleece, though. It's just called "microfleece" on the signs and bolt ends.