They're wonderfully comfortable; flexible, but sturdy and with good stability.  I bought them for folk dancing class, but they're so comfortable I wear them almost all the time.  I have bony feet, and after years of dancing have developed hammer toes and plantar fasciitis. The toe box is high enough to prevent any rubbing on the tops of the toes, and the height of the heel with the air bubble is wonderful.  I was little afraid of the European sizing, but it works out fine. And if your feet are narrow - the laces  close snugly around the foot.