Our Signature Sock Yarn! … New formulation as of Dec 1, 2007. Now this undyed sock yarn has been reformulated into a 3-ply merino -- the springy/bouncy wonderful merino -- with just the right twist. Round and firm yarn, good for cables and details. This is the merino version of BFL Ultra! -(also by Wool2Dye4, but in Blue Faced Leicester.)