Exceptionally comfortable if excess width can be managed.  This is the most comfy and cool slipper I've found for use in my Florida hard tile home.  However, that said, the manufacturers clearly have misgauged the width of the average person's foot!  Incentivized by the slipper's low price and cushiness (is that a word?), I found an adaptation that made them work for me (and I think some people might be willing to do as well): I cut a piece of thick fleece fabric to the shape of the upper and glued it inside, reducing the space inside for my foot.  It worked perfectly!