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What you should know about memory foam in general
on April 22, 2008
First of all, sleeping on high quality memory foam is a dream. Perfect amount of support on anything you put on it. I put a 2" toppper on an 8 year old futon that you could feel the frame under it and it was like sleeping on my parents $5500 bed.
*Two Things* you have to know, density is everything. 3lb is cheap, 4lb is average and 5lb is premium. 2lb has no 'memory' to it thus very little support. Easy to push in and it basically comes back out instantly.
Second is...IT AGES. I'm on my second Serta 4lb topper and both were awesome until about 8 months before I noticed that there's less and less 'memory'. At 11 months, it feels like 2lb foam that doesn't provide a lot of support but rather foam you would think you'd pack stuff with. I compared areas that would be compressed often and the most to unused corners (near the feet) and there was some but very little difference. So it seems use isn't the factor but rather age. I stuck a glass object on it and measured the depth it sank and was going to measure the time it took to sink but it was basically instantaneous compared to when it was new when it would sink like somebody in quicksand (can you tell I'm an engineer...).
So memory foam...Awesome...but has a shelf life. Something to keep in mind when considering to go foam. I don't know if the mattresses have the same issue but if I had to guess, they would probably be less affected.