How does the firmness of a foam mattress change over time?

The firmness of a foam mattress, including brands like Koala, Sealy, and Emma, generally decreases and softens over time due to material compression and regular use.

Foam mattresses gradually lose firmness as the materials adjust and soften with use, especially during the initial break-in period. Over several years, continued pressure and environmental factors can lead to further softening and eventual sagging, with longevity depending on the quality and density of the foam.

For instance, modern Australian mattress brands like Koala, Sealy and Emma recommend regular rotation and use of supportive bases to help maintain firmness and extend comfort life.