The history of flip-flops can be said to be quite long. As early as thousands of years ago, humans used animal skins or all available materials to wrap the soles of their feet. That can be said to be the earliest prototype of flip flops-the most basic mechanical principle of shoes. ! As for later, Japan and Brazil will carry forward the flip flops. In addition to the typical Japanese clogs-style flip flops, Brazil’s gum-style is the most comfortable.