The importance of density.
Memory foam beds are available in a range of densities. We use two main densities when creating our mattresses. A 4.2 lbs density and a 5.3 lbs density.
Density ratings are not the only thing that determine the feel of a memory foam mattress. A 5.3 lbs memory foam mattress can have an IFD rating of 10 and feel very soft , or an IFD rating of 18 and feel very firm.
Density ratings are usually an indication of the quality of the memory foam mattress. A memory foam mattress with a density of 4.2 lbs will last approximately 10 - 15 years. A memory foam mattress with a density of 5.3 lbs will lastapproximately 15 - 20 years.