This iComfort Hybrid Blue Fusion 3000 firm mattress from Serta features a premium hybrid mattress combining a luxurious cushion firm feel with Serta's most advanced temperature regulation technology. It features their exclusive TempActiv gel memory foam and a layer of EverCool Fuze Gel Foam for pressure relieving comfort and enhanced airflow. A layer of Serta Support Foam gives this mattress a firmer feel when compared to the 3000 Plush. Your body gets exceptional support from the Serta Hybrid Coil support system, which is built to deliver the ideal trifecta of comfort, support and durability. Plus, the Serta Micro Hybrid Coil works with this system to closely react to every contour and movement of your body for relaxing and supportive all-night comfort.