Built to provide years of restful, solid support for your slumber, the Elmhurst Extra Firm features a 850 Individually Wrapped Coil unit (in queen size), topped by a 2" firm comfort layer and gel memory foam. The coil-encased edge of the Elmhurst Extra Firm prevents excess edge compression that can occur after years of sitting on the side of your bed. This model is THE bed if you're looking for a super firm feel and support system. The Elmhurst Firm is adjustable base friendly. The Elmhurst Extra Firm is approximately 12.50" thick. 10 Year Non-Prorated.