LUCID 14 Inch Memory Foam Mattress - Triple-Layer - 5.3 Pound Density Ventilated Gel Memory Foam - CertiPUR-US Certified - 10-Year U.S. Warranty - Twin XL Dual memory foam layers create a medium-plush feel with excellent support Ventilated design increases airflow and breathability Soft, breathable TENCEL blend cover helps regulate sleeping temperature Conveniently compressed and boxed for easy shipping and set up Foam has a density of 5.3 pounds and is CertiPUR-US certified for safety and performance