andrewa wrote:What about NRS hydroskin socks - thin neoprene ?
That was going to be my suggestion too.
I have two pairs of sealskins and they do work okay.
The NRS Hydroskins are now my go to sock for cold, slushy, wet/snow trips. Fine while you are moving and I find them very warm. I like them more than the sealskins as I'm not limited to the water depth. Once you get water in the waterproof socks it's just like boots and it's requires a drain to get it out.
Just layer a thin liner sock under them.