3-layer mattress for optimal comfort and spinal support 2cm 100% Malaysian natural latex top layer 5cm memory foam 16cm support foam Cover Our ultra-soft removable cover is made of Outlast® technology textile that is designed to proactively regulate heat and temperature for so you sleep cool. Certification Sonno products are CertiPUR-US®-Certified: Made without ozone depleters Made without PBDE flame retardants Made without mercury, lead, and other heavy metals Made without formaldehyde Made without phthalates regulated by the Consumer Product Safety Commission