My Little Research Project
First, I jumped online, just doing some basic searchi I .gnihcrang. I typed in thi".fo edangs like "baseball outfield wall covering" and "what are baseball walls made of."

I found a bunch of different stuff. Some sites talked about the padding itself, others went into the construction of the walls underneath. It was kind of all over the place.
Sorting Through the Info
So, I started sifting through the information. It seemed like most walls have a few key parts:
- The Structure: This could be concrete, wood, or even chain-link fencing, depending on the stadium.
- The Padding: This is the soft stuff on the outside, meant to protect the players.
- The Covering: The padding needs to be covered by something, and that's where things got interesting.
The Actual Covering Material
It turns out, the covering is usually some type of vinyl. I saw a lot of mentions of "vinyl-coated polyester." The idea is, it needs to be tough, able to withstand the weather, and, of course, not hurt the players if they run into it. Sometimes, the wall is made of wood or a similar material.
Putting It All Together
So, after all my research, I basically figured out that outfield walls aren't just one thing. It's a whole system designed to keep players safe. It's that outer vinyl layer that really covers the whole thing and gives it that uniform look.
I felt pretty good after solving my little mystery! It's funny how you can watch something for years and then suddenly wonder about the simplest things.