I’m an unpadded side sleeper who highly values a good nights sleep. Only managed one good nights sleep on my zlite.
Xtherm works well for me, just got a 1/8th” gossermer gear thinlight pad to use with it for when punctures are a concern, or when a tad bit more insulation is desired.
Xtherm is 2.5″ thick, 430g, thinlight is ~75g (haven’t cut it down to match xtherm size).
(A regular zlite is 410g).
If I were to go with a closed cell mat, I’d make a franken mat and glue more foam into the hip area at first, then other places through trial and error.
Majority of my nights out lately (far too few :( ) have been on snow, hence the xtherm love.
I really think the xtherm is overall the best mat on the market, but it is expensive and if you’ve been getting along with a zlite you might not need the insulation.