Does Your Bed-in-a-Box Need a Box Spring?
Briefly

Box springs were introduced in the late 18th century to provide support for mattresses that lacked quality. They consist of a wooden frame with innerspring coils or a supportive base, designed to prevent sagging and enhance mattress longevity. Despite modern mattress advancements, box springs remain relevant in some setups, offering durable support complementary to contemporary mattress designs. As mattresses evolve, box springs may become less necessary, but they can still play a beneficial role in specific configurations promoting better sleep quality.
A box spring involves a wooden frame or base that contains innerspring coils or has coils set atop the base. A fabric casing is often involved to keep everything contained. This is a deliberate design choice, because the coils in the box spring are springing up to meet the mattress atop it.
Support was, let's just say, pretty abysmal. Think of a bed completely filled with hay, and more often than not that's what you had to work with. The box spring was meant to alleviate that lack of support with its introduction during the late 18th century.
Read at WIRED
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