Memory Foam
By Kaiser Khan, Editor Updated First published
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In short
Memory foam is a type of polyurethane foam that slowly springs back after you press it. It also changes with temperature. Body warmth softens the area you lie on, and a cooler room makes it feel firmer. Foam density in kg/m³ and hardness describe the grade better than the thickness in a product name.
About 1 minutes to read
Definition. Memory foam is a polyurethane foam that slowly springs back after pressure. Body warmth softens it, and a cool room makes it firmer.
Most mattresses use memory foam as one comfort layer over firmer foam or springs. Very few are memory foam all the way through.
New memory foam can smell for a few days after unpacking. Air the room well.
Full guide: memory foam mattress explained. Also: foam density explained.