My son wears this size and would have to get an upper size or something wider because you try to put your foot in and the straps are so close to the actual flip-flop that there no room to put your toes in. Absolute nonsense for how much they are. There’s no wiggling room very tight!
Do yourself a favor and don't buy these sandals unless you want your feet to be blistered and sore. Despite buying the correct size, the top of my feet were red and sore after waking in these for less than an hour. Horrible product. $10 sandals from a street vendor in Puerto Vallarta were better.