Sealskinz waterproof socks, they really are the way forward. I work on construction sites trudging around in mud regularly, I tried them for the first time last winter and I cant remember having cold or wet feet once! Worth every penny.
Yep Sealskinz are great once you get past that feeling of walking in a paper bag. Cant fault them thou, great product
Get the army ones - same sock just green and cheaper They are odd when you first put on but fine when in your boots -