I purchased my usual size 10 mens & they were too large.The placement of the top straps were too far forward so that the balls of my feet were sitting right on the toe bar/gripper. Plus the sole of the flip was thinner than my other Crocs & didn't provide enough cushion. Both of those factors made w...earing these in my bedroom on a hardwood floor unbearably uncomfortable for the short time I tried them on. I even tried putting an insole in them & still a no go. I have 2 pair of Crocs I love, one is the all terrain black marbled clog style & a leopard print regular clog style. Both are VERY comfortable. I have sent the flips back for a refund since a smaller size still wouldn't have enough cushion for my arthritic, high arched feet. My high arch more than likely was a reason they didn't fit either. I don't understand why there is a difference in the thickness of the sole on the flip from the sole on the clogs. I would think they would have the same sole as the all terrain Croc since it is an all terrain flip. If you decide you want to give these sandals a go anyway, I'd recommend you buy a size smaller.