There are no half sizes. I usually wear a 7 1/2, but the 7's in crocs were too small -- I could feel my toe rub the end. I got an W8, and it's roomy, but I heard you want a little room in there. The bottom also says M6, so I suppose thats a MEN's 6. They are not leather. Crocs are this foamy rubber stuff, squishy. Feels great. Can wear without socks because the material is made in such a way that your feet don't sweat or stink. I have on socks right now just because the vent holes make it too airy right now.