The Sopora Contour Changing Pad - 34" is 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 Sopora Contour Changing Pad - 34" has Baby Safe seams that will keep fluid leakage, bed bugs and dust mites out, keeping the inside of the mattress clean. Baby Safe seams are dropped to the sides of the mattress 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.