Okay, Kiwi Fresh'ins should pay me for how much I am going to talk up their shoe inserts right now.
In Paris I bought a similar product--a disposable shoe liner--to wear in all my ballet flats that I didn't want to wear socks with.
I have wanted to buy them ever since I've come home, but never found them in the US. Well, today I found them online at Kiwi for Women!!
Seriously, if you like to wear shoes without socks, and you hate the tiny footie socks (since they fall off half the time anyway), you should get some. Find them here: Kiwi Fresh'ins (a.k.a. every girl's lifesaver). They are only $3.99 for a six-pair pack.
I haven't tried this particular brand before, but I think they would have to be seriously unfortunate to disappoint me.
Hooray! (And you're welcome in advance.)