Innerspring Mattresses:  These traditional mattresses feature tempered steel coils in a variety of configurations. These springs are what provide the support while layers of upholstery provide insulation and cushioning between your body and the spring unit.
Hybrid Mattresses: This style of mattress is a combination of high-density memory foam or latex and an innerspring bed to give the comfort and feeling of an innerspring and the pressure relief of an all-foam bed.
All-Foam Mattresses: Instead of coils, these mattresses use either latex or viscoelastic memory foam cores as the support system.