I've so far only worn these two workdays, and I assume they will conform to my feet soon. They are comfortable enough, and seem sturdy. BUT they have almost no ventilation! Only a small row of pinholes along the sides near the top. My feet get very warm during the day as I do a lot of walking and not just standing. I would like these a lot if they had some ventilation near the arch of the foot and more across the toes.