Can someone explain this to me? I see insulated waterproof boots with 200g 400g and 800g. If I was going to be spending some time in say the ozark mountains in winter what would be a good amount of grams to go with? I live in Texas where its always HOT so I have no experience with proper insulation. All I know is I can't stand cold feet. I already have Goretex fishing jacket/bibs and with layers underneath these things keep me warm on the lake in 25 degree weather so all I'm lacking is the boots.