Luuf Cooling Support Firm 13-inch Hybrid King Mattress delivers firm, reliable support and cooling performance for sleepers who prefer a more supportive surface. Its 13-inch hybrid build pairs a responsive coil support layer with memory foam and polyurethane foam to stabilize the sleep surface and relieve pressure in targeted zones. A breathable cooling cover and ventilated foam layers help dissipate heat, the mattress ships compressed as a bed in a box for easier delivery and setup, and it performs well on a foundation or box spring while including a 10 year warranty for long-term confidence.