I'm a size 8.5 with a rather wide toe box, so I ordered a size 9 and they fit well. They're heavier than I expected, but not too heavy. They have no heel, thank god, and a cushy insole. They're a little snug over the top of my arch, so wearing them with socks was uncomfortable. They come up just above the ankle, but my large ankles fit with plenty of room to spare.