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The 800 Extra Firm mattress features Serta’s Cool Action Gel Memory Foam and premium 886 Custom Support Individually Wrapped Coil Innerspring. It is designed with a unique set of features to help solve 5 common sleep problems, Helps reduce tossing and turning with Cool Action Gel Memory Foam, Encourages proper back support and alignment with Serta’s 886 Custom Support Individually Wrapped Coil Innerspring, Promotes a balanced sleep temperature with an overall mattress design that helps promote airflow, Minimizes impact from partner movement with a premium support system and advanced foams designed for motion isolation, Resists sagging and edge roll-off with Serta’s Comfort Last Construction and Best Edge Foam Encasement. This mattress also features an extra-thick layer of Serta’s Support Foam, which combines gentle cushioning with extra support for more firmness throughout the mattress. Plus, a lower coil gauge innerspring design helps give this mattress a firmer feel than the 800 Plush and Super Pillow Top models. This mattress is compatible with a Serta adjustable foundation. Comfort Scale Rating (of 5) = 1.