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I would look at the cabelas trans Alaskan boots also. On sale for $153 right now. As warm as the baffins if not warmer in my opinion, and completely waterproof. Run a little small so I ordered a full size up and they fit great
Now what I need to do research on is a BASE LAYER. It looks like the BPS shop (their XPS) version looks good. I am not sure which one to go with.. 1.0, 2.0 or 3.0 for shirts and same the pants. Is anyone using BPS base layers?
Both of those boots have too much insulation. Unless you're sleeping outside without a sleeping bag you don't need more than 600 gram Thinsulate in your boots. Many winters working at ski resorts taught me much about boots and outerwear. One thing I learned is when your feet sweat they will get colder than when they are dry. I used to wear the warmest rated boots I could get. Now I wear 400 gram boots when the temps are above -10 and 600 gram boots when it's colder. My feet are more comfortable now that they were with the heavier boots. That makes my whole body feel better.
Could not get my feet in the cabelas boot had to go 2 sizes up,then I could not get them off .And they walk funny.Bought the Baffins ,Tag said water proof. So I bought them.i Then I found out threw Baffn its only the first few inches that are rubber ,the upper part that is nylon are not water prof. Feet got wet from cutting holes with Auger.I now have plastic bags between linner and boot.Only boots I know that are good for -100 and water proof also have steel toes in them