Whew, just under the wire! These mansocks are for my March SAM 5 entry.
The sock pattern is vintage - 1955, to be precise. It's from "Socks", a booklet published by the American Thread Company in 1955. 2x2 ribbing turns into a cable running down either side of the leg. The original pattern calls for 4" of ribbing but 2" looks more modern. (Probably more importantly, I wanted to get to those cables!)
The yarn is Regia Bamboo (45% bamboo, 40% wool, 15% Polyamide), one skein per sock. According to The Knitter's Book of Yarn by Clara Parkes:
The fiber is unique in that it contains an antibacterial and bacteriostasis bioagent that stays in the fiber even after the garment has been washed fifty times...The fiber's cell structure is made of microscopic holes that provide for extremely rapid moisture absorption and evaportation, giving it an excellent ability to breathe.
Cables + antibacterial properties + wash- and breathability? Now that's a sock!