This is my 2nd pair of this model of Sanuk. I still wear my 1st pair around where nobody can see them(at home) since they've torn out around the side toe area a good bit.  These slippers are my go-to around the house/around the yard slipper here in mild CA.
I really don't 'wear it' most times over my heel but usually just slip into it. To me, these aren't really meant for long 'serious' walking where you could crush your foot or trip and fall since they fit loose and casual.  These are great with or without socks as well. I do pull them over my heel and wear a sock to help them stay on if i drive with them on.
They are also my fave's to wear pre & post hiking and golfing.