What is stay mat?

"Stay mat" is a somewhat ambiguous term, and it could refer to a few different things. To clarify, can you provide more context? For example:

* Where did you see or hear the term "stay mat"?

* What is the general topic or situation it's related to?

* Are there any other keywords you can provide?

Knowing more about the context will help me understand what you mean by "stay mat" and provide a more accurate answer.