King Mattress, Ssecretland 12 inch Individually Wrapped Coils Innerspring Mattress, Pocket Spring Hybrid Mattresses with CertiPUR-US Certified Foam, Plush Yet Supportive Individually Wrapped Coils: Ssecretland Individually Wrapped Coils Innerspring Mattress is supported by hundreds of individual pocket springs, which is durable in use. Memory foam with 3D soft knitted fabric on the top increase its comfort level. Support system: Tempered steel coil system provides powerful support to each part of your body (Feet, legs, hips, waist, shoulders, neck, head), catering your vertebral well. Tightly knit edges and reinforced foam maximize edge support. High Permeability: 3D knitted dual-layer cover allows the mattress to breath freely, creating a dry, restful sleep. Also the Coil system permits additional airflow. Certified Safe: Our mattress materials are certified by CertiPUR-US without harmful substances like formaldehyde, mercury, and other heavy metals, ensuring a healthy sleep and get good indoor air quality.