This won't help for winter mountaineering boots, but I have a wide foot, and so always go to Zappos.com, and order the super-wide New Balance hiking boot.
I have always had problems with hiking boots being too tight, until I finally found the right super-wide New Balance boot.
I was in REI several weeks ago, and just out of curiosity asked the shoe sales guy about super-wide boots, and told him my experience with New Balance. He confirmed by saying New Balance had established a market niche by manufacturing shoes for us ducks.
