Hybrid is the key!  I've tried a lot of expensive mattresses from mattress stores.  This is the best mattress I've found in decades.  It's more comfortable and firm than a memory foam and you don't get that sinking feeling.  The top layer of memory foam is perfect and I don't get sore hips from sleeping on my side.  I've ordered more for our AirBnB rentals, they are that good!