Our "Nobody is perfect" skeins contain minor flaws and are marked accordingly:
K = nodes in the strands
F = Color defect or a failed coloring
FF and ZF = thread defect or yarn defect
Underweight = is noted with the gram weight of the strand.
felted = slightly roughened
This yarn is non-scratchy and is virtually indistinguishable from Superwash sock yarn due to the identical twist. Its knitting characteristics are also similar to Superwash sock yarn, but you'll need 2-4 fewer stitches than usual for socks.
