1971 Challenger SEMA Resto-Mod Sema Build

Great project...my dad has a '71, love that car.

I just have a couple quick questions about the roll of material up against the wall that you have pulled underneath the car. What is it and where'd you get it? :) I'm guessing it's some kind of fluid-absorbing sheeting, that'd beat the heck out of having floor-dry scattered all over the place.