Indicates the main composition of the mattress, such as innerspring or memory foam. Some so-called "hybrid" innersprings include one or more levels of foam on top.

Upon my initial tests, it took me back to my high ... a bed. Sealy Posturepedic has three beds to choose from, the Posturepedic Spring, the Posturepedic Hybrid and the Posturepedic Plus Hybrid.

Though Sealy offers a variety of mattresses, we decided to keep it simple and test its flagship product, the Sealy Posturepedic Hybrid mattress ... it took me back to my high school days.