These shoes have a genuine leather outsole. There is a protective film on the sole when you buy it. That protective film is to prevent the soles from being scratched when you try it on, and it will be torn off when you actually put it on. The leather outsole is delicate, so you can't get wet when you wear it. When the sole gets wet, it will swell and you can't step on uneven ground. In fact, there is no need to stick the bottom, just pay attention when wearing it.