I ordered a 6 as it is my normal sizer and these fit perfectly. I have only worn them around for an evening, but they are quite comfortable. It's strange to feel the air come in from the soles, but I hope this will help dry my feet out faster at the lake or beach. We cruise often and I hope these will come in handy to walk the rocky beaches of Maine to playing beach volleyball on the hot sand. I love how you can tighten them for support to feel like an athletic shoe.