I moved here from Thailand, and have very narrow feet (double A). This brand is one of few that fit me well. It does seem to run 1/2 size small. A friend has a normal width foot (but not wide!), and this boot also fits her.
My husband is American, and is a retired National Park Ranger with narrow feet (B). He has 4 pairs of Montrail shoes/boots which he loves. He wore one pair all over Thailand, Indonesia, Burma, Cambodia, and Laos during the 1 1/2 years he lived here. As an outdoor professional, he likes a snug fit and this brand has that.
We are both happy with the fit and quality construction of Montrail boots. OK, this sounds like an ad, but the fit was very difficult for us until we found this brand.