IFD (Indentation Force Deflection), also known as ILD, is the measure of the firmness of a foam. It is used in everything from memory foam to car seats. IFD/ILD measure the deflection of a foam under a load. The specific IFD test gives the foam a numeric IFD value. The higher the number, the firmer the foam. This means, for example, that memory foam will have a much lower number than a base foam for a mattress and a car seat will have a higher number than mattress base foam.
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We often get asked about the density of the memory foams we use in our memory foam mattress and memory foam topper pads, and once in awhile about their IFD/ILD rating.
And while we are happy to provide this technical data, I want to be clear that these technical specs alone do not give you a real indication of the comfort of a particular memory foam mattress or topper.
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Memory Foam Mattress Glossary
Terms You Should Know Before You Shop for a Memory Foam Mattress
Cover – The cover or ticking is the outside of the mattress. In the case of a memory foam mattress, it is a cover rather than a sewn ticking.
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