These slippers are comfortable when standing because they have a decent amount of padding in the sole.  The bottom (outside) of soles are more durable than regular slippers and they feel as if they were made for walking outdoors.

The only problem for me is they are a bit tight with socks which doesn't help much for circulation, warmth or comfort when sitting.  I would have bought the next larger size if it was available.  I will keep these slippers, but I'm doing my best to stretch them out.