I wear Dr. Scholl's Fast Flats. They're like wearing mittens on my feet. There's literally nothing there except a really thin piece of fabric/leather. It's like socks. They're not good when it's raining and I know they'll suck this winter so I'll have to find a substitute this winter. And they're cheap! Like $10 at Walgreens! I like them.
Edit: Ok, they're $11 at Walgreens right now, but CVS, Walmart, Target and Amazon all have them as well. Walgreens only has black, but I believe Amazon has tan colored ones.