The 11 fit fine and I'm a 10.5 so I think it runs a tad small. I found them a fine comfort level for the price. A bit like those Adidas massage sandals that most feet are fine with but some people hate. Nothing about this really screams quality, but for the price its totally ok. Its just a big plastic rubber slide sandal. Fine for the mat or showers or anything you won't have to do a lot of walking in.