I tried Cabelas 2 mm socks at Blue Heron Bridge and USVI over the past 2 weeks. I really like them.
It allowed me to use closed heel fins, which I prefer, in 72 degree water.
They are long enough to tuck under the wetsuit and keep the feet quite comfy, at least at 72F. I think they were as warm as a 3 mil wetsuit boot since they cover the entire leg at least 1/2 way to the knee. They also avoid water pumping into the boot as you fin along.
To get them on, all must be wet or all dry. A wet foot and dry sock did not go on but dunking the sock made it work. My foot is a 10.5 to 11. I bought the 11-13 size (L) and I could not use a smaller one.
And at $13, its not expensive to try it.
I tried a link below to the socks on their website.
