In this video I assume? https://www.youtube.com/watch?v=BfwIgSC9Ka8
It's regular liquid latex that's used. Foam latex is a much harder beast to wrangle and most importantly foam latex can't be slip cast (the process that is used to make the shoes and can be used for a number of other things as well) because it, as the name implies, foams as it cures, filling in most if not all of the volume of the mold.
Hope that helps!
just that! thanks a lot
Heh heh... just saw that this conversation is four years old. Oh, well. Better late than never.