100% Polyester Cal King Size Memory Foam and Innerspring Mattress: This 12 inch hybrid mattress features the enhanced support of pocketed innerspring coils and the cradling cool comfort of gel memory foam for an overall medium feel Resilient Support: This cal king size hybrid mattress includes a coil spring system, sturdy edge support and zoned uplifting foam that pushes up for better back and body alignment, delivering support with personalized pressure relief in any sleep position Cloudlike Comfort: Whether you are a stomach, back or side sleeper, you will find soothing breathability, motion isolation, and durable, high quality materials that hold their shape with a Sleep Innovations memory foam mattress in a box Made in the USA: The Shiloh Hybrid mattress foam is made in the USA. Our mattresses, mattress toppers, and pillows are all hypoallergenic and made with CertiPUR-US certified foam that is free of phthalates, heavy metals and ozone depleters, with low VOCs Feel Better with Sleep Innovations: We invented the memory foam bed in a box and continue to deliver sleep restoration today with innovative foams and fabrics; This cal king bed mattress comes with a 10 year warranty