Meindl Hunting Socks.
Without doubt the best knee high socks I've ever owned. Ribbed, fitted, fit my big calves. Smart enough to wear with breeks and boots/brogues, warm and comfortable, with an elasticated top that stays up where it should. I've been wearing them in their previous iteration for the last three or four years, and have managed to wear out two pairs in that time. The current version is as Alantoo says, slightly different, but they're even better if anything. They're merino wool mix, so wonderfully warm and comfortable. Need to be washed carefully, like any other wool socks, but even Mrs Scape hasn't managed to shrink any of the ones I've had. They do a short version, but they won't go under 11" boots as they're not quite tall enough.