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Memory foam is a viscoelastic material that adjusts and conforms to the contours of the shape pressed against it. Visco (thick, resistance to change) elastic (returning to shape after distortion).
The difference between memory foam and regular foam is the character of response. Regular foam will return to shape immediately and can be likened to the inserts in a couch cushion. In contrast, memory foam has a much higher capacity to adjust to pressure and contours of the body.
You can benefit from memory foam if you are uncomfortable in a spring mattress, toss and turn at night, have back, shoulder, or neck pain, or if you need additional pressure relief and comfort to help you sleep.
The feel of memory foam is determined by three things that include Density, Firmness, and layer thickness.
Memory foam was originally developed for NASA by a company called EAR Specialty Composites. The resulting CONFOR Foam is a slow recovery foam that's used to protect components from damage by dampening impacts. NASA saw the advantages of supporting and protecting their astronauts during launch and re-entry.
Following that realization, the use of memory foam in the seating and instrument protection spread to nearly all aircraft, especially in military aircraft such as jets and helicopters where pilots are subjected to high g-forces.
Later, once production resulted in pricing that made it affordable, engineers made some modifications to the foam composition and translated it for use in the bedding industry.
Density is a measure of weight (pounds per cubic foot). Many densities are available that usually range from 3lb to 7lb. The ideal density and industry standard is between 4lb to 5.3lb which is what Tempurpedic and Amerisleep use.
The difference between lower density foam and higher density foam is the memory characteristics. Lower densities will have less of a "memory" to the foam when compared to higher density foam.
Typically, denser foams greater than 5.3lb will cause the user to feel more "stuck" in the mattress when compared to the alternative - mattress that uses foam between 4lb and 5.3lb.
Since the firmness of memory foam fluctuates depending on temperature, the best way to measure firmness is based on the thickness of the support and thickness of a memory foam layer on top.
You're probably asking yourself, "So what firmness is right for me?"
The best way to determine the right firmness is to start by deciding how your current mattress either satisfies or causes discomfort. From there, check your sleeping position. Consider your body's shape and match it with the correct firmness to give you proper spinal alignment.
Of course, you may find that your taste is different. That's okay! From plush to firm, we've selected the ideal range of choices to satisfy any comfort need.
Consider your body's shape and match it with the proper firmness to give you proper and natural spinal alignment.
In addition to the density, the feel of a mattress, despite many advertisements and marketing schemes, is based on the ratio and firmness of memory foam and supporting layers.
Based on consumer reviews and ratings, we've found that the ideal mattress will have between 2" and 7" of memory foam on top of the support layer. Typically, with a thicker layer of memory foam, you'll experience a softer feel. With a thinner layer, you'll be closer to the support layer resulting in a firmer feel.
Indentation Force Deflection (IFD) is the amount of force, in pounds, that is needed to indent a round indenter foot into a foam sample a certain percent of the total thickness. Essentially, the machine that measures the IFD is measuring the perceived firmness of the sample. As the "foot" presses down into the foam, it measures the resistance and how much force is required to press the sample downward. Higher ratings (such as 30+) are firmer while a lower rating (25 or less) is softer.
Simply put, the IFD rating of the foam will determine the feel of the mattress. A higher number translates to a firmer feel while a lower number produces softer feel. However, it is not a complete measurement of a "soft" or "firm" feel. A higher IFD rating of a lower density foam can feel soft when compressed.
You care because it's a measure of firmness, usually associated with layers in the mattress. A higher number is firmer while a lower number is softer.
Good news! You may be able to use your existing foundation so long as the following is true:
You wouldn't buy a new car with old shocks. A foundation helps prevent sagging. So it's important to maintain a quality supportive surface for your mattress. Don't risk the durability and warranty of the mattress.
If in doubt, throw it out.
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