* The thong part of the flip-flop should fit comfortably, neither too loose nor too snug. Straps that are too tight could rub and cause blisters. Too loose straps may result in you losing the shoe at a critical moment – resulting in injury.

Should I size up or down for flip flops?

When in doubt, you're better off going up the size, as having your feet hang off of a small footbed is worse than having a little extra space. With that said, for any Vionic sandals only available in whole sizes, our recommendation is to size down to the nearest whole size if you typically wear a half size.

Is it better to buy sandals bigger or smaller?

Your sandals should comfortably accommodate the widest part of your feet so that they are not cramped in. ... Sometimes, it's better to go one or half a size bigger than your regular shoe size, as during the day your feet may expand, especially during the warmer months or if you're standing for long periods of time.