What eats holes in exercise mat fabric and foam?

[Cobul]

I have an exercise floor mat which I just bought new 2 weeks ago but there was already holes at bottom not caused by me or factory defect. What kinds of ants can eat fabric? And what fabric could they really bite through? Or are they attracted to the polyethylene foam inside? Does this taste sweet?

 

[Tom.G]

Looks like they do!



(above found with:
https://www.google.com/search?&q=do+ants+eat+polyethylene)