Novilla Hybrid Mattress - A COZY HOME MADE SIMPLE! Why choose Novilla Hybrid mattress? Clean, Dry, and Comfortable Sleep experience - Hybrid helps regulate moisture, temperature, and odors, and can guarantee a clean and restful sleep environment. Edge Support - Hybrid offers good edge support, no worry about sinking or rolling off while you sit on the mattress edge. Ideal For Any Sleeping Positions -Designed according to the human body curve, helps eliminate pressure points, balances support from head to toe and offers quality sleep. CertiPUR-US Certified - The Hybrid infused is CertiPUR-US certified, it is safe and provides you and your family a healthy sleep. No Risk - 100-night sleep trial and 10-year limited warranty, shop from Novilla with confidence. What is inside the box? 1x Novilla 12 inch king Hybrid mattress 1x Novilla mattress opener 1x Novilla manual card Warm reminder: A slight odor from the new mattress is harmless and will dissipate after a short time. Everyone has their own view of firmness. We recommend giving your new Novilla mattress a chance to be used to your sleep position within a few weeks. If you still can't sleep well, please contact us freely at any time, we are always on standby to assist you. Please Give your Novilla mattress 72 hours at least to fully expand to its original shape.