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What is memory foam in a mattress?
In short
Memory foam is viscoelastic polyurethane foam that slowly recovers after compression and softens with heat. Density (kg/m³) and foam firmness rating describe grade better than thickness alone.
More detail
It appears as a full core or as a comfort layer over support foam or pocket springs. Avoid saturating the foam when cleaning.
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Updated 2026-08-03. All answers