I know that Bryan's site is not for advertising stuff that other people make normally, but I thought I would pass these along:
http://www.leisurepro.com/p-pcsss5/pica ... ocks-black
Picasso makes a sock called the supratex. It has a kevlar like covering on the bottom. They come in 3 and 5 MM, and sizes up to 2xl for those of you who, like me, already have fins when you swim without them on. I bought a set of these so that I could dive my original Jet Fins, which are the old original Georges Beuchat design and cannot be worn with a conventional wetsuit boot. I can't believe that I stumbled across an operational set of original Jets, but I had to have them. Here is a stock image of what they look like, if you haven't seen a pair before:
Anyway, these socks are all black, tough, and perfect for vintage diving. Mine are unlined, which makes them very warm as well. Just throwing it out there.