Firm Support Boasting a comfort rating of three, the King-Sized Serta iComfort CF2000 Firm Mattress is the perfect fit for back and side sleepers alike. Serta Line: Serta iComfort Model Name: CF2000 Additional Information CF2000 Description: The CF2000 is an unquilted firm mattress model released in 2019 that is part of the iComfort product line manufactured by Serta. Gel Active MAX Foam allows a memory foam sleeping experience without being too warm. Corrections: Have an update or correction to our information about Serta iComfort CF2000? Air circulation is amazing with Gel Active Max Foam and Carbon Filter Memory Foam Serta iComfort CF2000 firm mattress. The Serta iComfort CF2000 Firm memory foam mattress is incredible to sleep on. The CF2000 Firm mattress is a firm comfort that we rate a 3 on our 10 point Comfort Scale (a 1 is hard, 10 is I have suffered from hip pain when sleeping at night for some time. We've reviewed this bed's featured and highlights for you, please read our review below: Comfort Scale Rating. The iComfort CF2000 Firm mattress is the firmest model of the 6 'CF' models in Serta's iComfort collection. If you're looking for a firm mattress, the King-Sized Serta iComfort CF2000 Firm Mattress is a superb option for your guest room, bedroom, or living space.