It's not a real sock yarn, but with US needle size 9 or 5.5 mm it goes real fast and that was important!
Not like the other sock that is still waiting for completion on 2.5mm needles...
They will get done one of these days, too.
While checking into the knitting of sock heels, I came across this genius video which shows how to knit a boomerang heel without these nasty holes that you create on the purl side of the heel. Check it out - even though it is in German, the video shows the "backwards knitting" pretty well:
I will use it for the next pair of socks and will keep you posted how it goes.
And off I go to do my daily (?) exercise program.
Have a great day!