Birkenstock sandals for use around the house. Uncomfortable for a couple of days, then incredibly comfortable.
But last year, rather than the sandal version, I got the closed toe, leather slipper versions. And I wear them everywhere. To the point where the sole wore out in 9 months, but I had a cobbler replace it.
My only gripe with the sandals is that rocks, twigs, etc come in from the front. It still happened, but far less commonly with the closed toe.