Density (weight (aka pounds per square foot)), the ILD rating (Indentation Load Deflection), resilience, and how tensile the memory foam mattress is.
The first thing we recommend when buying a memory foam mattress is to look at the weight/density of the visco elastic foam and materials used in the mattress.
The recommended memory foam density at the memory foam network is no less than 4 lbs. the reason we suggest memoryfoam mattresses with 4-5 pounds density is because many memory foam consumers have complained in the past about how the memory foam mattress did not last more than a few years with lower memory foam densities. These mattress customers obviously were not armed with the memory foam fact that when a person pays hundreds less for a memory foam mattress, they are either paying for cheap materials or not enough viscoelastic foam materials in the mattress.
Many of the memory foam mattresses we are referring to are memory foam mattresses sold at retailers such as Costco, Wal-Mart and overstock.com.
In recent years, prices of memory foam mattresses have gone down and mattress buyers are now able to purchase viscoelastic mattresses with 4-5 lbs density or higher at very competitive prices. This is obviously due to the ever-growing popularity of memory foam products.
The next thing to consider is the firmness, or ILD, of the memory foam mattress. This rating tells you how hard or soft the memoryfoam material is. This memory foam rating is based on the firmness of the visco elastic foam, not the rest of the materials in the memory foam mattress.
The memory foam ILD rating is very important when considering that some of the best memory foam mattress savings can be found online.
Knowing what the memory foam mattress ILD rating is and how you should use this factor in order to find the best memory foam firmness is crucial. An ILD rating of around 13-15 ILD would be comparable to memory foam brands such as the Tempurpedic mattress. Also, try to consider around 3-5” inch thickness of the memory foam layer in the memory foam mattress.
As a person sleeps on a memory foam mattress, the visco foam material is continuously redistributing their body weight on the memory foam mattress which, as a result, relieves the pressure points that often cause joint and muscle pains that cause the sleeper to toss and turn throughout the night. Whenever a person does move, the memory foam readjusts to the new position on the memory foam Tempurpedic mattress. This readjusting of the viscoelastic foam materials is the difference between memory foam and traditional foams in furniture. This difference is graded in terms of HR ratings. HR (high resilience) foams are different from visco elastic foam as they actually push back when displacement occurs. So the harder the displacement, the harder HR foam pushes back. The problem with HR foam is that it causes pressure which in response causes discomfort and constriction of the user’s circulation. Memory foam in contrast adjusts itself in order to provide a balanced, comfortable longer term experience while providing much needed support.
The visco memory foam measurement of tensility simply describes the memory foams ‘stretch ability’. Even though this is rarely an issue since the only time a memory foam mattress is stretched, or compressed, is when a person is using the Tempurpedic or other memory foam product. If a person usually requires a more tensile memory foam mattress or memory foam product due to more weight that will be compressing the viscoelastic material, then this would be a useful factor to consider.
Overall, for most, we have observed that temperature sensitive memory foam mattresses with 5-6 lb density visco foam with 13-15 ILD rating and 3-5 inches of thickness would be able to provide enough comfort and support for most people.
The most ideal memory foam mattress density for a human body is about 5.9 lbs.
Any more memory foam density than that would be too dense and would not allow the visco foam to collapse properly inside the Tempurpedic mattress which would not allow your body to settle into the memory foam mattress.
In contrast, if there is too little memory foam in the memoryfoam mattress, it would result in a lack of hip and shoulder support. In addition to the lack of visco support, the lighter memory foams will quickly lose their visco firmness and begin to lose its ability to recover.
In many cases, either too light or too much memory foam density would be more of a waste of money as it really would not be offering any more comfort or support to the Tempurpedic memory foam mattress buyer.