This is a foot massager. It looks like a gigantic slipper, and that's kind of what it is. A slipper for two feet at once that also massages your feet. Did I mention it has two hippos on it? That's because it's from a company called Farting Hippo. But of course!
But hey, despite the weirdness you've got to admit that it wouldn't be too bad to get your feet massaged every now and then. And hey, hippos are cute, right?