The new carpet included jute padding, but not under the seats and back to the rear wall of the cab. The darker gray here is the back side of the LMC heat shield and the lighter, more colorful gray is a section of padding we ripped from the stock carpet that wasn't stained; we cleaned it anyway. It fills the area that lacked padding on the new carpet. Is this a necessary step? Probably not. But since we are going to be in the desert of the Southwest with this truck more than anywhere else in the country, we figured more heat insulation won't hurt.