I love my Munro Robyns. I don't have these sandal/booties but they've been well reviewed here.
I would say Munro runs a touch narrow.
I got regular width in my booties. They're fine...but if they were leather vs. suede I would almost have been tempted to get a wide. I never order wide shoes, for reference. My forefoot is "regular" width and I fit most regular width shoes...although occasionally I get a corn on my right foot between little toe and fourth toe (due to width).