I've used a Ridgerest closed cell pad for many years of backpacking. It looks like it's been chewed up from enduring miles of bushwhacking but it still pads and insulates.
My regular hiking buddy is too soft for just a ridgerest so he also carries a Thermarest (self-inflating) pad. Trouble with the t-rest is that it loses a lot of its function if punctured.
The RR takes up some space but is indestructible and weighs nearly nothing. That's my choice.