Alright, I don't have a huge expectation that anyone will know what I am talking about. After running classes for a few hours my feet pick up a fuzzy substance from the mats. I am not sure if this is leftover mop fiber, fiber from the carpet that is next to the mats (my studio is in a strip mall) or some other source I am not aware. We do the standard, leaf blower and sweep, mop the mats every class cleaning scheme, but for whatever reason there always seems to be this fiber layer. Has anyone else experienced this, if so do you have any solutions?

Yep, I get that all the time as well. Lint from socks, etc, and gis. I just chock it up to floor spice and try to make others roll in it, not me ;)

Have you considered the possibility that you might be a hobbit?