
Exped
MegaMat Series
Car camping comfort champ, but some side sleepers find it thin.

Running these analyses costs money. Buy through my links to help keep lights on! I may get a small commission.
I've got a hammock one from them that works incredibly well. I have different brand ground sleeping ones, but it never hurts to have a spare. Even if it only ends up usable in the Summer, that's when friends are borrowing gear, anyway. I think I'm going to get a couple of these to go with my loaner gear.
Ahh ok then yea low or no R-value would be fine in those cases. Klymit also makes a good lightweight low R-value pad, it's what I used in Texas and worked quite well in warmer weather. Not as heavy or thick as the one you linked, but much lighter and packs down smaller. Great if you're backpacking but there are better options if car camping imo. Exped Ultra 1R is also a good pad, the more insulated 3 and 5 are also popular for colder temps. I've used the Dura versions which are a heavier/more insulated version and it was comfortable. I've also heard good things about Nemo Tensor but have no experience with it.
My car camp pad is an exped mega mat, wonderful. Saw a cheaper version at Scheels by Lightspeed? Dense foam with air and it holds well. For backpacking, I need lightweight and use a Klymit5, love it, but 3 nights on it I’m wanting a hotel.
I use rhe Klymit insulated pad - excellent!
Lonnnng ago when I was a kid a few pieces of thick cardboard made great insulation but not super comfortable. Now days I think the cardboard with something like a yoga mat or a folded Cargo Blanket on top would work well. Now, I use a Klymit (the red one) insulated inflatable pad and it is very warm and comfortable. It is not cheap though - around $80 US.
I use a cheaper blow-up Klymit with some reflectix r21 over the top. Super light and cost effective. My blow-up pillow has an elastic strap, which i use to keep them together at the head, and at the toe, I just use a piece of paracord. I've done this for years and never felt the need for a $200 + sleep mat.
Until I was almost 30 I really only needed something for the insulation as opposed to cushioning so I agree with everyone that said your kids will be fine on cheaper/simpler solutions. I often slept in a sleeping bag on top of an extra comforter blanket. I also agree with the full on air mattress sentiment if you’re car camping and not concerned with packing and space. I’ve never done this but know people that that do. I keep my gear small (as I like to motorcycle camp) so if you want something that doesn’t take up a lot of room have a look at the brand klymit; their cheapest inflatable sleeping pads are $50 but are as comfortable as some high end brands that can cost @ $200.

Exped
MegaMat Series
Car camping comfort champ, but some side sleepers find it thin.

Exped
Ultra Series
Lightweight side-sleeper comfort, but a bit pricey and bulky.

NEMO
Tensor Series
Ultralight side-sleeper comfort, but slippery and prone to leaks.

Big Agnes
Rapide SL Insulated Sleeping Pad
Comfortable with side rails, but heavy and warmth claims disputed.

Therm-a-Rest
NeoLoft™ Sleeping Pad
Very comfortable, good service, but heavy and bulky for backpacking.

Ranked #1
Exped - MegaMat Series

Ranked #1
Exped - MegaMat Series

Ranked #1
Exped - MegaMat Series

Ranked #1
Exped - MegaMat Series

Ranked #1
Therm-a-Rest - NeoAir Xtherm Series