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I don't have a memory foam mattress but I do have a memory foam pillow. It does contour quite a bit, you do sink into it. Overall I have to say it is the best pillow I have used to date. I don't know what density it is but the pillow is much heavier than any pillow I've used. Not sure how that translates to a mattress. I've had it for about 2 years now and no issues with flatness, it still springs right back within a minute or so of me getting up. I don't think the bacteria would be any worse than a regular mattress.
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