Thickness! The firmness and softness at the same time is amazing. I put it on a 17” platform frame in a sleeping nook in a beach house. As a result it sits at window level and actually creates the effect of sleeping/floating on a dead calm sea!
Finally my wife is waking up with no pain, she suffers fibriomialgia and the mattress has help her a lot amazing. For me finally could sleep a little bit more, usually a wake up very early now I sleep an extra hour. Thanks.