Serta Perfect Sleeper Lagoon Nights Innerspring Medium Mattresses have been improved to give the best comfort possible for every type of sleeper! The Lagoon Night series has essential cooling features and targeted pressure support. The 825-coil density system delivers contouring support that minimizes motion transfer and an extra deep foam rail extends the sleep surface while reducing edge roll-off. PillowSoft® Aire Foam provides enhanced cushioning that promotes airflow for maximum comfort. A gel foam lumbar support band provides support for your lower back and hips. All Perfect Sleeper Mattresses are 100% assembled in the USA and are CertiPUR-US® Certified, which means they are free from harmful chemicals and gasses. This mattress is 13.5″ high.