Comfy, stay on the feet when you walk, solid rubbery bottoms are textured and not at all slippy, well sewn.

Update:  Long term review.  They lasted exactly two winters, and I wore them pretty much every single day, since I'm retired.  I'd even wear them outside for quick errands about the yard. They were pretty shabby and beat up by the end.  I replace the insole once.  The leather uppers are still in useful condition, but the rubbery bottoms have dried out and are starting to smudge stains across the floor.

If they have your size, these are a good deal.  Watch the prices, they seem to range between $40 and $80 depending on the season.