What's the difference between 10#, 20# and15# Memory Foam in a mattress topper? Which is the more comfortable?

Question

Have you ever slept on either 10#, 15# or 20# memory foam topper and if you have, could you comment on the difference between these three weights?
It seems as though the 10# would not be as "dense" and the 20# but I'm not sure.
Please don't just tell me there's 5 Pounds difference between them; I'm not completely stupid.
There must be some measurable difference in these three weights or they wouldn't make all three of them would they?
I'm usually a "back" sleeper, sometimes on either side, if this makes the answer any easier.
Thanks all.

Answer 1

you are correct # is for pounds in some cases it is how much the stuff weighs per cubic foot and in some instances it is the amount of weight it takes to compress it a certain amount or how rigid it is. They sound like they would be the same thing but they are not. two samples from different manufacturers could be the same weight or density but the cell structure could be larger bubbles with stiffer cell walls. the quality if the foam comes in to play. within a given manufacturer the higher the number the "harder" the foam.

Answer 2

Guide To Visco Memory Foam Mattress Firmness
http://www.myfoammattress.net/memory/ild.html