Because we are PNW hippie-esque people, we keep our thermostat at 65, and I am always chilly. Two pairs of socks didn't work. REI's expedition socks didn't work. These slippers are toasty! I wear them with socks so that they don't get stinky.
Besides being warm, they are also comfortable. The sole is durable enough for some light dogwalking, trash-taking-out, and mail-getting.
I've only had these slippers for a couple of weeks, so I can't speak about their durability, but they look very well-made.