They’re acupuncture shoes, they have hard bumps or blunt spikes inside. It stimulates the entire foot at once so it hurts a lot. Usually old people use them more than younger.
It's not flipflop.. I don't think westerners got this. But in every Asian household that acupuncture slippers is so common. I remember having that when I was young and extremely hate it. It says to promotes and regulate your blood flows. 😅 My dad used to really love them and he walk around the house wearing those. It's amazing how long changbin, IN and hyunjin was able to jump rope with that slippers. I'll be Han in a second.
