My insulated leather boot runs 600 grams. Over 600, and my feet sweat too easily if I have to move, & I just don't like sitting still all that much anyway. I have a pair of glacier boots for icefishing that I'll wear if it gets down around 0 or lower, but I don't like them if I'm moving. If your sitting on a bucket or chair on the ground, it helps to have a bit of styrofoam insulation under your boots if that's practical.
