True to size Will slightly stretch with use. Comfortable walking and lounging in. I wear a 4EEEE in width, purchased one size up, alter a week they stretched to contour my foot. They’re just fine.
Bought for my son with wide feet he’s usually a 10 but decided to size up to 11 because the 10 felt a little tight. After about 2 weeks of wearing everyday to school they have stretched out a bit. Still a great buy but just keep in mind they do stretch out especially if you’re planning on wearing often.