I was having a hellova time keeping my feet warm. I've tried a ton of heavily insulated boots. A few years ago I bought a pair of Under Armour uninsulated boots. They kept me pretty damn warm as long as I wasn't sitting for a long period of time. And even when I was for a few hours or so. I was over insulated in the past and I think my feet were probably sweating and then I was getting cold.
1200g of insulation is a lot. If you're moving I'd stick with 400 or so.
