In reply to Phil1919:
In sprint to autumn, I generally wear running shoes, so my feet get wet on river crossings etc, but dry quickly afterwards. I've tried Sealskinz, but my feet overheat; they're good for winter running when cold feet hurt!
When wearing boots, for winter (non-snowy) walking or when cold and wet in summer, I just wear normal socks and take them off for river crossings (and put the boots back on over bare feet).
I'd expect wet suit socks to be very sweaty for walking.