A memory foam mattress should be properly identified and matched to its user—much like an expensive pair of shoes is fitted to your foot.
In this day and age when everything is slam-bam, throw it together and make a sale, it's hard to imagine that there was actually an era when people took time with you to find out what your needs were and try to match the correct product to your exact standards.
One of the first things that a good mattress should provide is proper support without creating pressure points.
The most common place where pressure points occur is at the hips and shoulders for side sleepers, and at the upper back and rear end for back sleepers.
To eliminate pressure points, the memory foam mattress should be made from visco-elastic memory foam with a density of at least 5 lbs.
This means if you cut a giant cube (think of a giant dice that's 12" x 12" x 12") from the foam, it would weigh 5 lbs.
The best support comes from the foams between 5-6 lbs. of density.
The next consideration is whether you tend to like a firm, medium or soft mattress. You'll need to know a little bit about what makes a mattress soft, medium or firm and that's not rocket science. It just takes a little knowledge of how this is all measured.
The measurement of softness is different from the density of the foam, so don't let that confuse you, okay?
The softness (or firmness) is rated by what's called "Indentation Load Deflection" and the lower the number, the softer the feel of the mattress.
The ratings for memory foam mattresses usually range from 8 (very soft) to 20 (very firm).
Then your preferences for how you sleep—back, side, stomach or a combination of them. It really does make a difference if you sleep in one position all night or if you tend to toss and turn all night going from one position to another frequently.
Your body size and weight will also be a major factor.
For someone who is in the lower one-hundred-pound range, a mattress that's ideal for a larger person might feel extremely hard and non-giving. You would probably want to stick to a mattress with an ILD of 12 or less and maybe a 10" thickness.
For those over 220 lbs., you probably won't be happy with one of the 8" to 9" mattresses because you might tend to bottom out on the memory foam.
A good answer to this is an 12"+ mattress with additional memory foam.
Take a look at some of the links below and choose the one that will most likely fill your need.
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