The feeling you get when you first lie down on a mattress comes from the foams and fibers used in the upholstery layers above the core support system (whether innerspring or all-foam). Serta uses a variety of advanced comfort foams and fibers, all designed to provide enhanced cushioning for a more comfortable sleep. Comfort choices vary by mattress collection, but many Serta mattresses offer a variety of comfort choices for choosing your ideal sleeping surface.
The support layer of a Serta mattress consists of either a traditional steel coil innerspring, or an all-foam support core. All of Serta's support systems are designed to provide proper back support while you sleep. When it comes to an innerspring support system, the number of coils in a mattress varies from manufacturer to manufacturer and is based on a queen-size mattress (i.e. twin mattress have fewer coils, kings have more); but the coil count is not necessarily as important as the construction.