I purchased some "Windstopper" neoprene socks from a local outdoor sports store awhile back. It wasn't that exact brand (is that a brand name?) but pretty similar. Neoprene with something like a thin fleece inner lining. I bought the XL size because I wear size 13 shoes.
First of all the socks are VERY hard to get past the heels of my feet. It's almost a workout in itself getting them on and off. But the other morning I tried them out when it was 21 degrees outside. I just wore the socks, and my normal SPD shoes. 2 pairs of tights came down over the tops of the socks.
Before mile 10 I could feel my toes getting cold and by the time I got to work at mile 15.5 they were straight up numb.
So did I use these things incorrectly? Should I have worn my Smartwool socks and then put the neoprene socks over them? I'm afraid I may not be able to get them on over the wool socks, or the combination might be too large to fit inside my shoes.
If it wasn't user error, then I need to return these things to the store and get my $25 + tax back, because right now they don't even seem worth 25 cents to me.