I ordered these from Capezio's site and I have danced Zumba for over five years in them (2-3 times a week). I am normally a 9 1/2 narrow in regular shoes but ordered a 10 as advised. Size 10 street shoes on me are usually too long and too wide but these fit very well from day one and did not need a break in period.  They grip when I need them to (jumping) and slide when asked (side to side). They fit so well that they remind me to cut my toenails when I get too busy with other things.  I have to get new ones right now because the canvas has split on the inside where the big toe starts and when I wear white socks the split shows (otherwise the shoes are fine).  I don't wear these shoes for anything but Zumba.  If you like shoes that are so light that you might forget that you are wearing them, these are the ones to get. The split sole allows your foot to bend but also provides enough support for those of us who are flat footed.  If I did not need the soles to be in good shape for zumba, I'd wear them outside the studio.