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AH never knew this but would explain the last years coldness, thought it was my bag just ageing (probably is a bit), but got a new decathlon matt last year thats smaller/lighter/deeper than existing mat (mountain hardware I think), but never been warm on it. Old one is a thin foam inside but the whole matt blows up a bit beyond the foam, not super deep, maybe only 3cm, but never had a prob.
So think your right, totally open matts = lighter, deeper, less big when packed, yet not good for anything below 5-10c I would say.
BrickMan
@Bearlegged
While static air (such as that trapped in closed-cell foam) can be an effective insulator, mats like these with thick air chambers effectively set up little convection currents that are rather good at moving heat from one's body to the massive heat sink that is the ground.