What's that stuff called?

[runner421]

I've seen a lot of questions about what the stuff is that lines under most travel trailers. You know, the black plastic uhh. . . ??
So - anyways - found this in stock at the local Home Depot. It's in white but I think you can get it in black.
Called: Plastic Cardboard. Comes in 4 X 8 foot sheets. Easy to cut.

 

[profdant139]

It's called Coroplast. They make it in various thicknesses. It can be expensive.

Or they often use black vinyl tarp material.