I'm shopping for a couple of mattresses for a new bunk bed — the top bunk mattress needs to be 20cm thick (or less) which is making it really tricky to find options.
So far I've uncovered this one from Zeek, but keen to scrounge up some more contenders. I've looked at the usual names (Emma/Sleep Republic/Koala/Sleeping Duck/Eva) and nobody has anything that thin. Even a specialist like Bunkers starts at 21cm.
This is for a couple of kids (6 & 4, still sub 20kg each, but obviously… they get bigger…) and I'm keen to stick to the 20cm max for safety reasons (yes, ideally we wouldn't be using bunks at all, but that's the space we have and the bed we've picked at least allows the top bunk to be configured as a low-ish loft bed for now).
https://www.freedom.com.au/product/24408738
15cm high
Google "low profile single mattress"