** I PURCHASED THE 'SEALY PERFORMANCE CRYSTAL SAND QUEEN MATTRESS WITH REVERIE O200 ADJUSTABLE BASE'** I wanted a Firm mattress and this was advertised as Firm Foam and also fell under the list of Firm mattresses. It is not firm enough and not much back support. Also, if you decide to get the Reverie O200 adjustable base, like I did, it sits very low to the floor. The picture is quite deceiving. I gave it 3 stars because the mattress is not uncomfortable but not as advertised.