Re: Boots in Antarctica....
The original poster was asking about boots for a tour to the peninsula during the summer.
That is a world away from the proper boots for a South Pole winter.
McMurdo - summer and winter - is somewhere in between. Raytheon provides well-insulated work boots for McMurdo. There aren't any work boots good enough for a South Pole summer, much less a South Pole winter - so they provide FDX boots or Bunny Boots (formerly known as Mickey Mouse boots, which now refer to a black version of the same thing).
I know some people trying Baffin boots for the South Pole winter, but otherwise - FDX and Bunny boots have to do. Of course, there's very little going outside during the winter in any case, and certainly not for more than an hour.
Me, I wore FDX boots with the boot liners and three pairs of socks (sock liners, polar fleece, and wool). That worked pretty well down to 60 below - though I started to feel just a little of the cold after spending several hours at 60 below (F).