This is my second pair of Sanuks, the other being the unlined pick pockets.  I really love the pick pockets and they're great for summer wear.  I was looking for a comfortable slipper type shoe that was warm enough to wear barefoot in the winter.  I saw the Sanuk "Chill" products which have a warm lining and decided to try them out.  So far I'm really liking these although I can't speak for durability, but my other pair has held up very nicely.  I wear these mostly around the house and out to run errands in the colder winter and spring weather when there is no precipitation, although they do state they have some water resistant properties.  They are also great to wear to the rock gym because of the ease of on and off and the advantage of already being barefoot if you're into that.

Now to the important part that I think most people are looking for, the sizing.  Many reviewers have also focused on the sizing for these shoes in particular because of the thick lining.  I almost always wear a size 11 shoe without fail and rarely deviate from that size.  I was torn in this case because of other reviews and almost bought a size 12, but I didn't.  The lining does make these fit a bit snug, but they will stretch and break in very easily.  Keep that in mind when deciding on your size.  I do wish they offered half sizes, I probably would have got an 11.5, but I think the 12 would have been too big for me especially after the stretching and break in.  I would rather have a bit snug of a  fit that I know will relax over time than too large of a fit where my feet will slide around.  They were quite snug at first, but after only a few wears they have begun to feel just right.  So if you're torn on what size to get I personally recommend sticking with your normal shoe size, but it's obviously personal preference.