I did the same thing as lindel. The previous owner had tossed the carpet and rhino-lined the interior. I seriously don't know how the guy could stand driving it, especially here in Texas in the summer. Extremely uncomfortable. I found a set of used carpet from a local Jeeper, and added the bubble wrap /mylar stuff under it (bought it a piece of it at Home Depot).
'98 Jeep TJ Sahara, 31s, 2" lift, SRC front/rear bumpers with carrier, KC Daylighters and driving lights