Those are my shoes of choice and I keep several pair on hand. (I want insurance in case they're discontinued -- like Mares' original low shoe!) The soles aren't very thick, so they're not for walking any distance on rough or rocky terrain. They're very comfortable, make fin removal fast & easy, and dry quickly. They run about a half-size over. I think they're only made in full sizes, so an 11 should fit. If there's a Mares dealer near you, try them on and see if they're for you. Else you'll have to go online and take your chances.