The Ultra Breathable 2-Stage (dual-sided) crib mattress is crafted with a firm, flat surface with safety in mind. It is made with organic materials and free of harsh flame retardant chemicals. A breathable mattress pad is layered on top to keep your baby cool and dry and reduces the risk of overheating. It provides air circulation without the risks of traditional mattresses to help baby breathe safely. The Naturepedic’s patented dust mite proof, waterproof vinyl cover keeps the surface of the mattress protected from potential accidents and messes. Clean up is as easy as 1,2,3, just wipe it down with a sponge and warm water. It is also hypoallergenic, GreenGuard, and GOTS certified.