We know that your child wont only sleep on their Sopora crib mattress. If your baby spends time sleeping on it, we have you covered. All Nursery Essentials are made with Harvest ultra firm, high-density foam. Harvest foam was developed by foam industry leaders to deliver cleaner foam. All Harvest products utilize a blend of natural oil based and conventional polyols. Natural polyol is made from natural plant based renewable oils. This blend enables Harvest foam to perform as well as conventional foam without sacrificing comfort and helping the environment at the same time. Look at our complete line of ergonomic, CertiPUR-US certified, ultra firm, high-density foam sleep surfaces. The Baby Safe seams will keep fluid leakage, bed bugs and dust mites out, keeping the inside of the pad clean. Baby Safe 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 Essentials medical grade, baby soft covers are compliant to all safety standards. They are lightweight, pliable and naturally enable the babys 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. Ultra-Fresh treated for antimicrobial protection. The baby soft covers are smooth and maintain a consistent temperature under baby. They also clean easily with a damp sponge and wont retain unpleasant odors or stains.