I'm usually either a 7.5 or an 8.  These are a bit snug in a 7.5, but they're still comfy enough to wear all day at work, even with thick socks.  I'm a climber, so I don't mind a tight shoe - if you need wiggle room for your toes, maybe try a half size up.  The bottom of the booth is plastic or some kind of synthetic material made to look like wood.  They're holding up well, and a good buy for the price.