I have a slightly flatter foot than normal. One shoe fits perfect but the other slips around and the I feel like there's a lot of pressure on the medial and lateral side where the arch support is. Looks like a lot of other people have the same problem with the arch support being off. I feel like it's a potentially good shoe but I'm definitely trying a pair on in a store before I buy again. Receiving a pair of painful shoes when these are supposed to be one of the most comfortable really leaves you with a bitter taste in your mouth. Make sure you keep the box until you know you have a good pair.