Beautyrest's Harmony Lux Coral Island 13.5"" Extra Firm Mattress delivers an impressive degree of support coupled with advanced features for a luxurious sleep experience. Innovative materials work harmoniously to bring you restorative sleep with improved support, advanced motion isolation, and a lush cover. Head-to-toe support across the entire mattress is delivered by the coils of the Precision Support System, so you and your partner sleep undisturbed. Infinicool Lux technology coupled with carbon-infused foam helps you stay comfortably cool all night with its breathable, moisture-wicking fabric infused with cooling fibers and cooling technology. Pressure-relieving Beautyrest ActiveResponse Memory Foam helps ease aches and pains while also creating airflow throughout the mattress.