Inertia X Lite

I've slept on some version of thin inflatable over thin CCF pad for years now. I considered it a superior system for side sleepers, where the different layers work together to distribute pressure, and it's more durable. I was recently clued into the Mountain spring pad. Claimed weight ~103 g (mine on my scale is 105 g) https://www.aliexpress.us/item/3256809759809625.html I pair it with a cut down torso length pad. Often my Klymit Xframe cut down like an Xlite (which works well with a space blanket ground sheet between them). But I'm looking to pair it with a self inflating pad (also DIY cut down by half) https://www.aliexpress.us/item/3256807541654158.html It's still on order, but I expect that with a little tapering it will weigh less than 270 grams (half the weight of the rectangular pad), so in round numbers it should be ~370g for the 2 pads, and an r value of about 6 at the overlap, Legs only have r value of 1.5 plus the bonuses from egg crate, and using a mylar ground cloth. Seems like comparable stats and comfort but a significant weight savings.

I suspect that the "CCF on top" advice comes from the trend for manufacturers to put a reflective layer on one side of a CCF pad. That aluminum is probably going to give almost no insulation bonus under another (presumably UV opaque) sleeping pad. Though after reading some of the responses I wonder if this advice goes back to self inflating pads. If we're talking about a fairly thick fairly rigid CCF and a poorly inflated self inflating mat (maybe because I didn't want my moist breath condensing in my mat when it's cold). The combined insulation layer would be much more consistent with the CCF on top. I would also say that people are much more aware of insulation variation when we're pressed right against it. Let's run a little thought experiment. A backpacker is performing a series of tests over a set of nights of similar temperature. He is rotating back and forth between which mat is on top... And For simplicity let's say he has 2 mats similar to those described above. After a few nights of testing each arrangement he realizes that he is completely compressing his insulation in a few key areas with the self inflating mat on top, and he suffers cold hips and shoulders because of it. And the effect is much less noticable with the CCF on top... I would say that under these right circumstances (which incline borderline misuse of gear) CCF on top may have noticably fewer cold spots. Even if it does average out the same. I'm still team CCF on the bottom, but it's good to know complications I need to consider

I have tried many sleeping pads and have never had a problem sleeping on any of them. I have a Klymit Inertia X Frame pad that works great because it’s designed to go inside the sleeping bag. Love the fact that I never roll off in the middle of the night and is less likely to get punctured. It weighs 19oz. Will also add that I did a bikepacking trip in Canyonlands and had no trouble with my $69 Klymit. Meanwhile my brother’s brand new $250 Thermarest leaked air every night of the trip so he basically slept on the ground.

Im going to visit this summer 2 times in Lapland. To explore west side of Geaidno and Rastigaissa area to the Halkovarri. Im living next to Nuuksio National park, so if u want hiking friend for weekend, just write private message. Its is safe to hike around year, even in -20°C. But in mid winter naturally have to use skies. Last weekend I was overnight in Vääräjärvi, in East Nuuksio. I had Carinthia Survival dual layer sleeping bag, Klymit inertia, Under Klymit Inertia i had Kaira's Thermofolio Extreme foam pad. On top of Klymit i had Kaira's normal thin foam pad with 10 mm structural holes. If there comes dewpoints, it goes to thermofolio foam bad surface to keep my sleeping bag more dry. In Summer I have naturally different sleeping bag and only Klymit Inertia.

Anyone feel intertia series are backwards? Why are my hips and shouldes exposed but my feet and head so supported? Feet don’t matter and head has a pillow?

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.