All Sopora Nursery Essentials pads are made with an eco-friendly, 100% renewable, medical-grade, ultra firm, high-density foam. CertiPUR-US® and GREENGUARD® Children and Schools certified foam in the Sopora Nursery Essentials provide even ergonomic support. BabySafe seams are dropped to the sides of the pad creating a seamless, waterproof edge with no decorative cording or holes on the surface. This eliminates entry points for allergens, bed bugs and fluid leakage. The Nursery Essential's medical grade, baby soft covers are compliant with all safety standards. They are lightweight, pliable and naturally enable the baby's body to conform to the surface while allowing the inner construction to provide comfort and ergonomic support for which it was designed. The cover is vinyl, PVC, lead and phthalates free. The baby soft covers are smooth and maintain a consistent temperature under baby. They also clean easily with a damp sponge and won't retain unpleasant odors or stains.