Good question Evelyn one of my best buddies has flat feet and he is constantly complaining about his feet cramping up. I woul assume that any shoe that their foot is use to would help out in the situation.
Am adding my own question to this discussion: As an SUP instructor, I sometimes come across people with flat feet who cannot stand on the board for any length of time. Can anyone recommend a water shoe with built in support that will help these folks? Many thanks!