Firm Feel: Ideal for stomach and back sleepers with extra support; This quilted top hybrid mattress is not compressed into a smaller box and is Assembled in the USA Support: Serta's 5 Zone Response Design combines coils and contouring memory foam for full body spinal alignment; Plush coils contour and cradle your pressure points while firm coils support the natural curves of your body Pressure Relief: Serta's Perfect Conform memory foam works with the mattresses coils to further contour and cradle your pressure points for a rejuvenating sleep Cool Feel System: This cooling technology utilizes graphite infused memory foam to promote heat distribution and keep you comfortable throughout the night Certified: All Serta Perfect Sleeper mattresses feature a 100 Night Trial, a 10-Year Limited Warranty, and CertiPUR-US certified foams free of harmful chemicals, so you can rest easy; Plus, all mattresses are compatible with adjustable bases