Do semi-trailers belong to slippers?

Heelless shoes are also a category of slippers. After all, there is no foot wrap at the back. This kind of shoes is also lazy shoes, which is very convenient.

Slippers are a kind of shoes, the heel is completely empty, only the toes are in front, mostly flat, and there is no need to tie the shoelaces. Materials are usually quite light and soft leather, plastic, cloth, etc. The types of slippers vary according to the occasion and performance. For example, beach slippers are not made of cloth, but of plastic. This is because they are waterproof and easy to clean. The type of toe cap has also been specially designed, which is often called flip-flops, which is what we call flip-flops. But indoor slippers in winter, in order to keep warm, may use fluffy cloth instead of plastic, so that people can enjoy it better in the room. There are also anti-slip slippers for bathing and anti-static slippers commonly used in electronic factories and dust-free workshops.