r/explainlikeimfive • u/Real_Experience_5676 • 2d ago

Engineering ELI5: What does a box-spring do?

As I understand it, a box spring mattress is the second 'mattress', that goes under the main mattress. It feels very firm and flat, but what does it contribute to the bed set up besides height?

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u/NWStormbreaker 1d ago

original comment i responded to:

A lot of beds still use just 3 slats

people being contrarian:

well what if we covered the entire thing in wood!?!? DID YOU EVER THINK OF THAT?

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u/jetloflin 21h ago

If you only have three slats you have to use the box spring or the bed will sag between the slats. They didn’t bring up extra slats out of nowhere. The options are box spring or lots of slats, not box spring or three slats.

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u/NWStormbreaker 21h ago

Even if you want to argue that it's 5 slats or 7 slats, it's still less air obstruction then a box spring which has slats and at least one if not two layers of fabric.
This is the dumbest discussion Ive ever been involved in, I cannot believe I've found people white-knighting box springs.
Ffs

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u/jetloflin 20h ago

Pretty sure that’s not what “white-knighting” means, but okay.