break in period is rough cutting and grinding the toes and feet, but after a month or so they fit well and have become comfortable *update 1 year after owning*  I really loved these sandals the past year unfortunately they degrade very quickly. I live in northern va so it's not like I wear these year round and they still got worn out within a year. I have attached an image to show what I am talking about. This is just normal around town wear, nothing crazy