Night Therapy 11-Inch Supreme Spring iCoil Mattress, King Polyester jacquard cover features quilted fiber padding and 1.5 of super soft foam for comfort and conforming support 1.5 layer of High Density Foam above the iCoils provides additional support 7.5 base layer of independent spring iCoils assures no motion transfer from a sleeping partner, while maintaining customized spinal alignment Foam is CertiPUR-US Certified for durability, performance, and content All Night Therapy mattresses meet the requirements of 16 CFR Part 1633-Federal flammability standards