I ordered a half size up due to other reviews and that didn't turn out to be necessary - they were longer than I would have needed. However, they (for me) run narrow so while they are more than roomy enough in length, my foot feels painfully constricted during exercise when my feet begin to swell. I purchased these specifically for Zumba and though they hold up well in class (and tread is perfect for the dance moves!) as soon as I stop moving I can't wait to get them untied. They also don't have enough arch if you are high arched like me. They are comfortable and nice looking for normal wear but didn't work at all for something as strenuous as a Zumba class. Still looking for the perfect Zumba shoe.