For years that my family have been using Crocs products, and we love them, but on this one - the carlie flat (although it is really cute), we're not quite satisfied especially my 3 yr old daughter. Both feet sustained blisters after wearing them for few hours. Since then, she was hesistant to wear them anymore. It must be the contours on the inside that caused the discomforts. Sorry for the not so good review. Recommend other products but no this one.