【 📦Healthy and Assured Certification 】 Vacuum-packed kow mattresses are sealed in cardboard box. All foams of 12 inches king mattress are certified by CertiPUR-US and are inspected to contain no harmful substances. 【💤Mattress In A Box & Easy Setup 】Hybrid king mattress with a comfortable and breathable surface. Memory foam enhances airflow, dissipates body heat, and stabilizes your sleep temperature. Unboxing is a breeze, simply unroll, and wait it expand at least 48-72 hours. 【❤️Edge Support 】King hybrid mattresses are designed with individually wrapped springs,2 sizes wire diameter of innerspring: 2.0 mm(main body of mattress to support),2.2 mm(edge support ). Thickened springs at both edges improve the edge support of the mattress, providing stability and preventing you from rolling off. 【🛏️Strong Support & Pressure Relief 】King size hybrid mattress combined the supportive of pocketed springs with the comfort and adaptability of memory foam. Independent pocketed coils provide strong support to every part of your body. Memory foam actively contours to your body's curves, aligning the spine and relieving pressure point aches and pains. 【✅The ultimate customer service experience】Unique Design&Warranty With the side handle, easy to operate and flip the mattresses(1 time per 2-3 months). king size mattress