NOTE: These are seconds directly from the Russell Moccasin website.
I used Russell Moccasin's fit sizing app/tool, which put me at 6E 80% of the time (without socks, as instructed). The length is spot on; width is a bit narrower than I'd prefer, but I expected it since I'm usually EE. They're currently a tad snugger than I'd like with my usual midweight socks, but good with more lightweight socks. Really hoping they'll break in well. Cautiously optimistic due to the unique construction.