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.

Then, once I was sure the Serta iSeries 2.0 Hybrid was for me, I picked the level I wanted — I went with a queen-sized standard (1000 series) model, so it has a medium-firm feel, is 12 inches ...

$391.99 at Mattress Firm Serta iSeries 2.0 Hybrid 1000 12-Inch Medium Mattress, Queen Get 33% off this top-rated Serta hybrid mattress for a limited time only at Mattress Firm. $1,389.99 at ...