These shoes are my go-to summer wear. I've had them for a year-and-a-half now, and they're nicely worn-in and frayed (which will happen to cloth Sanuks if you wear them long enough.

I've worn them with socks (they're a little snug that way until they're broken in) and without (most of the time these days). If you want to wear them like flip-flops, you can fold the backs down.