How much do they weigh? Is the 600gm thinsulate really good to 65 below? Cabelas has a pair of 2000 gram thinsulate? How to trust these ratings? I'm looking for something to go roaming around deep in the colorado mountains in all winter weather. Thanks for any advice and q answers!

These boots are great! I spent last winter at a ski resort in SW Colorado doing parking when it was -10 outside in the morning, and my feet were fine. My toes would sometimes get a little chilly but I was wearing socks that had become thin in the front. I also would walk through snow that was waist deep, and combined with a good pair of Columbia snow pants, they keep the snow out all the time! With a good pair of socks these should be able to easily hit -40 degree with no problem.

>>I don't know about the ratings, but you'll probably never find >>temps colder than 20 below in Colorado, and these boots will be >>plenty warm for that.My Danner 600gm boots are warm to about 25 below if I am moving, otherwise warm to only about zero. I have a feeling the 2000gm boots aren't what you need, unless you are going ice fishing in the Dakotas for hours and hours. Compare the weights.Kent in SD