I have a Hest mattress which is also really nice, but expensive. It is made of a memory foam that is supposed to stay supple in cold weather, and doesn’t smell. One of the features that
@Old406Kid mattress has that I like is the fold in the middle, and I wish that Hest had that feature. Hest also recently began offering custom form fitted sheets for their mattresses which I bought and really like so far - it’s as comfortable as sleeping on my bed at home.
Another sleeping pad that I’m considering buying for car camping is the Exped Mega Mat 10, which is a combination of foam and air, depending on how firm you want your sleeping pad. REI has them on sale right now for 25% off.