The shrink wrapped stuff on pallets along both sidelines is the padding. The label says ProPlay-Sport20D. It comes from Schmitz Foam Products in Michigan. Each tile is 7.38 feet by 2.95 feet. Figured RP would want the specs. :)
I've used "shock pads" for playgrounds, so I have heard of the company.
What's amazing is how well they drain.
We can even "glue" the pad to a hard surface like concrete or black top and
water will drain, without affecting "adhesion".