The LUCID 6 Inch Gel Infused Memory Foam Mattress has a firm feel. The 4-inch high-density foam base makes it a great choice for children or people searching for a firm mattress that provides back support. Pair the natural benefits of a firm mattress with LUCID memory foam, and you'll be sleeping better in no time. The 2-inch comfort layer of premium gel memory foam quickly conforms to body for a comfortable top layer. Our breathable fabric cover ensures a soft sleep environment. LUCID memory foam is naturally resistant to allergens and dust mites; and the foam is CertiPUR-US certified. That means the foam used in this product has been tested and certified by an independent laboratory saying it meets special criteria for physical performance, indoor emissions, and environmental stewardship. It contains no formaldehyde, harmful phthalates, or PBDE flame retardants and is low VOC. We offer a 10-year warranty that protects the mattress and cover against manufacturer defects.