or "firm" feel. A foam of higher IFD but lower density can feel soft when compressed.

IFD measures the force in newtons (or pounds-force) required to make a dent 1 inch into a foam sample 500 x 500 x by a 323 cm³ (50 sq in, 8-inch-diameter) disc--known as IFD @ 25% compression. IFD ratings for memory foams range between super soft (IFD 10) and semi-rigid (IFD 12). Most memory foam mattresses are firm (IFD 12 to IFD 16).

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