Today, the term ‘box spring’ doesn’t always mean what it used to mean.
Traditionally, a box spring is a type of mattress foundation consisting of a wooden box/frame with coils or springs to support a mattress.
The coils are designed to take some of the weight off the mattress to ensure it lasts longer. They also absorb motion when you turn or move on the bed.
Box springs have been around for decades. They were originally meant for use with innerspring mattresses but quickly became popular with foam mattresses as well.
A modern box spring doesn’t necessarily have coils. They are usually wooden-framed boxes with slats or a solid platform for the mattress to rest on.
A more correct name for the modern box spring is a box foundation.
In this article, when I refer to a box spring I mean the traditional type.