I recently tried the Serta Perfect Sleeper ,a queen size mattress. I love the blue mattress covering and I chose a firm hybrid style . Well it is perfect! I have had the best sleep since it arrived. It’s plush feel is luxurious. The mattress is a hybrid which I think means it has a coil structure with layers of memory foam I’m not sure but it’s so comfortable compared to my old memory foam one . I definitely recommend this and I have never been more comfortable,impressed or excited than when I acquired my Serta Perfect Sleeper mattress!