From the manufacturer’s website:
The reputation of Bartlettyarns has been built on Fisherman Yarns, our specialty since the early 1800’s. Carefully spun with select domestic fleece, Fisherman Yarns retain some of their natural lanolin for softness and weather resistance--ideal for sweaters, caps and mittens. Available in a wide range of colors, including four pure undyed colors: Natural, Light, Medium, and Dark Sheeps Gray.
Bartlettyarns Bulky are spun on the “woolen system” for a traditional homespun appearance it is made a true unspun bulky yarn similar to Icelandic a bit thicker than Lopi.
Fisherman Bulky is loosely twisted from four plies of roving.
This yarn is marketed as Sheepsdown by Schoolhouse Press.