In many Asian countries, once you enter the room, you have to change into a cool mop to show respect for the owner and thanks for the sanitation of the room. At the same time, there will be special shoes for bathroom in the bathroom, absolutely not to be confused with other shoes. At the same time, there is a distinction between the shoes worn by the host and the guests.
In many tropical countries, it is a very common phenomenon to wear sandals outdoors. There are many people working on the streets in these areas, and there is absolutely no lack of a pair of comfortable sandals in their work clothes. However, in some high-end restaurants, hotels, entertainment places, etc., slippers are not allowed to enter, and signs are often posted at the door: "no slippers in", to give people a reminder.