No he is talking about the rad haz kit - it's a foam and foil lined liner for the inside of the soft top or hard top roof to help protect the crew from the radio emissions from the aerials from the outside of the vehicle.
Also does doubl duty as insulation. I have just the cab bit fitted to mine and it's quite good.
I think there are a few kicking around on eBay from time to time but they aren't that common anymore so price has gone up