Memory Foam Buyer's Guide
Part 3 - Memory Foam Really is Unique, and Has Unique Benefits Others
While specific types of memory foam do differ in the level of comfort they offer, looking at the broader picture, overall memory foams in general are unique in many ways versus other comfort products used in bedding.
I've looked at many bedding materials, from latex to cotton to wool. And nothing compares to memory foam in the way it conforms to your body and reduces pressure points.
Why is memory foam so different? There are a couple of reasons that memory foam is so unique.
First is the way memory foam cells deform when weight is applied. Unlike standard foams that compress and want to spring back to their original shape immediately, memory foam cells (open cell foam, which means the individual cells in the foam have holes in them) compress fully and spread their air pressure to adjoining cells.
This spreads the pressure through a greater number of cells of the memory foam - which decreases the pressure you feel in the cells of the memory foam that you are laying on. This accounts for the way that memory foam actually reduces pressure points.
This ability of memory foam to deform also allows it to really conform to your body's shape and weight bearing areas, thereby reducing these pressure points. No other material has this ability to shape to your body - this is unique to memory foam.
However while memory foam's characteristics offers unique comfort benefits, you wouldn't want an entire mattress made strictly of memory foam. Memory foam is too soft a material and isn't meant to be supportive. So it works best when layered over a firm, supportive material.
That is why you will mainly find memory foam as a 2" or 3" topper to be used on your existing, firm mattress, or as a 2" or 3" topping layer in a new memory foam mattress.
Second, memory foam is temperature sensitive. Which means that at lower temperatures it is firmer (more viscous), and at higher temperatures it is softer and more conforming (more elastic). This is the reason memory foam is known as visco-elastic memory foam.
This temperature sensitive quality accounts for the melting feeling that you get lying down on memory foam, and also accentuates the custom molding affect of the foam. Certain memory foams, such as Tempur-Pedic's ® Tempur ® foam, are fairly temperature sensitive and can get firm even near room temperature.
The memory foam used in our toppers and mattresses, in contrast, have a broader range of temperatures where they stay nice and soft, so they are soft and responsive at common room temps.