cis2554507 wrote an answer about Columbia Titanium Bugaboot XTM Omni-Tech Winter Boot - Men's on November 17, 2010
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.