I have two pairs of these, one in black and one in espresso. A lot of people consider them slippers, but I use them as my regular shoes. Except on warm days, I wear one or the other almost daily all over campus. In the spring or fall, they work well without socks, but in winter, when it gets really cold here, socks are a good idea.
These moccasins are well made and fit perfectly (I'm a size 10 in most shoes) with or without socks. I don't wear them in snow, but have been caught in the rain a few times with them on and they survived that very well. I got them at the beginning of the fall semester last year and it looks like I'll get at least another year out of them.
Love my UGGs!