You must order up 1/2 size.  I wear an 8 1/2 street shoe, but order these in a 9.  Have used these for power-Zumba classes and they are fabulous, great cushion, comfort. True to size.  Easy to wash and dry. No foot or leg pain after a challenge-level workout, well except exercise of the muscles. Capezio knows what they are doing for dancers! Can't beat the price and quality.  By the way, I change to street shoes, wearing these on the exercise floor only.  You should do this to protect the jazz shoe tac on the bottoms.  Great for Zumba pivot requirements!!!