King Size Mattress in a Box 12 Inch Memory Foam Hybrid Mattress with Pocketed Springs Medium Firm 30737129This medium firm hybrid mattress offers an ideal balance of support and comfort. Built with individually pocketed coils and multiple layers of foam, it contours to your body, relieves pressure points, and reduces motion transfer for a more restful sleep. Reinforced edge support enhances overall stability and helps keep your body comfortably centered throughout the night. Compressed and shipped in a convenient box, the mattress expands easily after