Just received this topper; and for first look, it's not what I expected.  I've slept on foam rubber mattresses for over 60 years, and I thought from the product details that this would be firmer than what it seems to be.  I have not yet used this product as it was bought for use in an RV which will not be used until this spring.  I'm sure it will make the bed somewhat more comfortable, but I just thought it would be firmer.  If after using it I find that it does nothing to make the bed more comfortable, I will write a second review.