They're not beautiful, but on days when I've had a rough time the last two years and it was chilly out, I would wear Crocs Mammoths without socks. I had another pair that I accidentally messed up so I saved the button-in liners and I just wash & exchange them. They'll wash up well as long as you hang dry them.

I also wore my daughter's Uggs boots. They were nice & comfy on the inside and not tight or anything.