If you do any research on Yeezys and flat feet, you are going to find a lot of opinions. Those who have flat feet are often concerned about the arch support and the way the midsole feels, as they should be. Some shoes have exaggerated arches that can feel very uncomfortable for people who have flat feet.  Yeezys do not have a tight arch that pushes your flat foot upward. Many people have reviewed these shoes and say they are some of the most comfortable they have ever worn with flat feet.  Of course, everyone is different and what feels comfortable for one person may not feel good at all to another.  Although these are highly comfortable for people with flat feet, they are mainly more comfortable for everyday wear. If you have flat feet and plan on working out in them, you may want more support than Yeezys can provide.  With the right level of support, your foot will not overpronate. Overpronation occurs when your feet turn too far inward and give you the flat feet effect. Overpronation can cause pain and limit your ability to run long distances or work out for too long.  For the moves required during working out, I would always suggest going for a shoe that's got more support, especially if you already have a condition such as fallen arches or flat feet.