Now you're probably thinking, "yes, that orthotic insole might be useful, but is it comfortable to use?" The answer to this question is, yes it is VERY comfortable . The orthotic insoles are made of non-slip EVA cushioning fabric. Hard, non-slip EVA helps you comfortably maintain correct foot and body posture. How? By making sure your feet don't slip so that you start to develop poor posture. So you'll always be comfortable, whether you're standing, walking or running!