The one I have is injection molded plastic with the sound deadener attached to the backside. I got it from Brother's. So far, I'm happy with it, though it does have a couple of issues that did give ma a little trouble. First, it isn't flexible, so it was somewhat cumbersome to install. I also had issues with fastening it, as the factory style clips wouldn't work with it due to the rigidity and a slight bit more thickness than OE. I ended up using 1/4 x 20 screws and nuts to fasten it down. There's one more thing, at the bottom, it doesn't lay flat, so the floormat actually has to be tucked under it in the middle.
Otherwise, it's actually a decent product. It's issues aren't really too bad to deal with, and it does it's job (dampening the noise and heat) rather well.
