What's the speed/texture of the custom solid black mat?

Was thinking about ordering one of the custom solid black waterproof mats, but there isn’t any information on the speed/texture of it. To my understanding, the texture should be a fabric surface, but which mousepad does it bear most resemblance to? Is it slower than all of the actual gaming mousepad options? 
To clarify, I’m actually looking for something slow anyways (like GSR slow), so it’d be great if there was a custom option that could be close to that