Rick Cronkwrote a review of Mammut Magic High GTX Boot - Men's on July 19, 2017
Familiarity: I've used it several times
Fit: Runs small
After a good breaking period of 60+ miles over the months leading to my three days on Mt. Shasta last week, the Mammut Magic did everything I wanted it to do. Some fiddling with proper socks and a good breaking period and I have not had problems with the fit. And, I nearly always have problems with fit to due to various foot issues. From stream crossings, very wet snow conditions, some rock scrambling, even a little bouldering, the boot proved worthy. My feet are two greatly different sizes. Even so, I went up a half size from normal and even down a bit in sock thickness. Which proved spot on, warm enough, dry and comfy. Never got cold, never got wet, never even sweated once I had the correct sock combo of thin liner and moderate sock thickness. Upon returning home, the boot shows little signs of having been worn after plenty of miles and three days of snow and rock scrambling on Shasta.
Thank you Backcountry.com.