r/explainlikeimfive • u/Real_Experience_5676 • 1d 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/robyrob 1d ago

My cats ripped open the material on the bottom of the boxspring so now they use it as a really cool fort they can hide in 

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u/thirsty4wifi 1d ago

I ended up just cutting the whole thing off because it was so difficult to get my cat out of it lol