I racked up a whopping 68 miles across six park days in Disney World wearing only these flip flops. My steps are often missed while I'm pushing the stroller so I'm sure there were even more miles than that. I always wear broken-in tennis shoes on big walking days and packed them with me just in case these flip flops didn't work out, but I never needed them! My feet normally get very hot and swell and I really hate wearing tennis shoes. I never wore these before our trip and was so happy there was no break in period at all. It even rained for hours on end one day and my feet were still comfortable in these. I just dried them with the hotel hairdryer that evening and wore them again the next day. The only time they were even the slightest bit uncomfortable was when my preschooler accidentally spilled orange juice on my feet and the piece between my toes got a tad sticky and rubbed. Fortunately it never caused a blister and once the fabric dried out, it was comfortable again. I would highly, highly, highly recommend these! These are going to be my forever disney, zoo day, travel, etc. shoes!! As for fit, I felt like these were a bit big. I usually wear a 7.5. I have pretty wide feet, so sometimes I need an 8 just because I need the width. I ordered an 8 in these since a half size wasn't available. The 8 felt fine enough to keep but if i order another pair, I believe I will go down to a 7.